Migration and illicit drug use among two types of male migrants in Shanghai, China.
Abstract: Large-scale internal migrations within China have led to speculation of increased drug use, but with little empirical evidence. This cross-sectional study examines the association between migration characteristics and illicit drug use in 100 general male migrants and 239 "money boys" (i.e., male migrants engaging in same-sex transactional sex) in Shanghai, China. Only three general male migrants reported any drug use. Among money boys, lifetime illicit drug use was 12%; Ecstasy and methamphetamine appeared to be the most popular drugs. In addition, depression prevalence was very high among both types of male migrants. Depression was associated with lifetime soft- and hard-drug use, while earning a higher income was associated with lifetime soft-drug use. These findings provide the first set of quantitative evidence of illicit drug use among Chinese male migrants. Although illicit drug use among male migrants is low compared to Western countries, its resurgence after 30 years of drug control gives cause for concern.

Keywords--Chinese, drug use, male migrants, money boys, Shanghai
Article Type: Report
Subject: Immigrants (Drug use)
Drug abuse (Demographic aspects)
Drug abuse (Research)
Drug abuse (Prevention)
Social networks (Analysis)
Authors: Wong, Frank Y.
He, N.
Huang, Z.J.
Young, D.
O'Conor, C.
Ding, Y.Y.
Fu, C.
Arayasirikul, S.
Pub Date: 03/01/2010
Publication: Name: Journal of Psychoactive Drugs Publisher: Haight-Ashbury Publications Audience: Academic Format: Magazine/Journal Subject: Health Copyright: COPYRIGHT 2010 Haight-Ashbury Publications ISSN: 0279-1072
Issue: Date: March, 2010 Source Volume: 42 Source Issue: 1
Topic: Event Code: 310 Science & research
Product: Product Code: E198450 Immigrants
Geographic: Geographic Scope: China Geographic Code: 9CHIN China
Accession Number: 239347332
Full Text: Historically, drug use (excluding alcohol and tobacco use) was practiced among various segments of the Chinese privileged class and was generally tolerated by society. However, since the British moved to forcibly impose the opium trade on China in the late 1800s a more rigid attitude deploring "moral vice" or "Western decadence" has prevailed (Booth 1998). Soon after the founding of the People's Republic of China in 1949, the government instituted a nationwide antidrug campaign, which, in conjunction with a "closed door" policy throughout the 1960s and 1970s, led to the proclamation of a "country free from drugs" for over 30 years. During this period, opium, heroin, and other illegal drugs were inaccessible to the vast majority of the population. Legal deterrence became the main weapon for fighting drug use, as drug trafficking was punishable by death (Bakken 1993). As a result, little attention was given to the prevention and treatment of drug addiction. By the end of the 1970s, however, these dramatic enforcement programs became increasingly difficult to maintain as China opened its doors to the West and foreign investment brought rapid economic development (Chen & Huang 2007; Gifford 2007). The rate of illicit drug use continued to rise throughout the 1980s and grew rapidly in the 1990s. In 2000, the lifetime prevalence of illicit drug use was just 1.52% (Hao et al. 2004) (which is very low compared to rates in Western countries); heroin, methamphetamine, and Ecstasy are the current major drugs of choice in China (Chen & Huang 2007).

As China broadens its engagements with the outside world, the government has made greater efforts to monitor and control drug use. It has established drug control entities in all of China's counties and cities, and the number of registered addicts is rising. According to the Ministry of Health, one million addicts were registered at the end of 2002. Close to 75% of these individuals are aged 25 or younger. A majority of these cases have been among hardcore users (heroin or opium) or addicts such as injection drug users or IDUs (Zhao et al. 2004). Nonetheless, the approach used is legal deterrence (i.e., being caught with subsequent incarceration/"cold turkey" detoxification) instead of primary prevention efforts such as voluntary programs similar to Narcotics Anonymous.

The limited information that does exist suggests that drug (legal and illegal) use/abuse is a growing problem. For example, a recent study, Survey of Drug Use among Middle Schools in Three Districts: 1998-1999, conducted by the Beijing University's Chinese Medicine Research Center (2001) with three sets of middle school youth (n = 2,742; 2,988; 1,038) found that the age of initiation ranged from 11 to 12.9 years old. Drugs used included alcohol, cigarettes, heroin, and painkillers. In a second study (n = 12,000) in 1997, 32.5% of male students and 13% of female students had ever smoked cigarettes (Beijing University Children's Hospital 2001). The average age of smoking initiation was 10.7. Other drugs used include alcohol and marijuana as well as tranquilizers.

To the best of our knowledge, national estimates of drug (legal and illegal) use prevalence are not available to the public. Meanwhile, large-scale internal migrations due to China entering the global economy has led to speculation of increased drug use. However, there is little empirical evidence to support this assertion; indirect evidence suggests that migrants who engage in high-risk sexual behaviors that might place them at risk for HIV infection also tend to use more alcohol (Lin et al. 2005).

A brief review of the historical context will help to provide a framework to better appreciate the emergence of drug use, as well as drug control efforts, in China. In 1958, the government instituted a nationwide household system (known as hukou) that assigned every individual to a particular place of residence and officially classified people as either urban or rural residents. Those wishing to relocate to another part of the country required official approval, allowing the central government to effectively control the social, political, and economic lives of its people (Zhang 2001). During the heyday of the hukou system (between 1953 and the late 1970s), the government was also able to control illicit drug use and trade (Cohen et al. 1996). In the early 1980s, however, the Chinese government undertook a series of structural economic reforms that improved the efficiency of farming and created a labor surplus of nearly 200 million rural laborers. The reforms simultaneously spurred rapid urban economic growth and a soaring demand for cheap urban labor. In response, millions of peasants began migrating illegally to cities throughout China. The city of Shanghai, China's largest center of commerce and finance, became one of the most popular migrant destinations. As of 2000, there were 121 million migrants throughout China, and Shanghai's metropolitan population included some 4.4 million migrants (Chinese National Bureau of Statistics 2002).

A growing body of studies is reaching consensus regarding the effects of migration on health (Anderson et al. 2003; He et al. 2005; Hong et al. 2006; Li et al. 2004). Repeatedly, researchers and policymakers alike have characterized China's rural-to-urban migrant population as the tipping point for many social ills such as the HIV epidemic (Anderson et al. 2003; Ministry of Health, UNAIDS et al. 2006). Of China's 121 million migrants, 60% are males and 40% are aged 20 to 24 (Huang & Yang 2000; Thomas 1998). Most of these migrants are either unmarried or married but living apart from their spouses and possess low awareness of HIV/ AIDS (He et al. 2007a, b). Without permanent urban household registration status, these migrants cannot access the social welfare benefits available to urban residents. They are also difficult to reach via traditional preventive health education, as migrants are often deprived of access to health care (McCoy & Yu 1999).

A subgroup of migrants, known locally as "money boys," engage in same-sex transactional sex activities primarily for economic survival. To the best of our knowledge, there have been only three English-language empirical HIV-related studies targeting this population (He et al. 2007a, b; Wong et al. 2008). Using a qualitative methodology (focus group), He and colleagues (2007a) found that money boys reported more encounters and experiences with soft drugs such as Ecstasy than did general male migrants. Usually, the soft drugs were introduced by foreign customers and were used to stimulate sex drive. Wong and colleagues (2008) found that non-gay-identified money boys tended to use more drugs than gay-identified money boys.

Anecdotal evidence also suggests that money boys trade sex for money (1) and drugs, and some money boys specifically target Western foreigners. A popular travel website (http://www.utopia-asia.com/chinbeij.htm) provides the following description and warning for tourists planning to visit Beijing:

The purpose of this study was to examine the association between migration characteristics and illicit drug use in two types of male migrants. Given the paucity of research on illicit drug use among migrants in general and money boys in particular in China, we have borrowed a conceptual model related to migration developed by Chng, Wong, Park, Edberg, and Lai (2003) to guide the present study. Acknowledging that Chng's model was developed to focus on the characteristics and experiences of Asian immigrants and refugees as well as Asian immigrant MSM in the U.S., we believe it is reasonable to assume that many characteristics and experiences specific to migration are common among most immigrants, refugees, and non-native or transient populations throughout the world. For example, migrant money boys in Shanghai likely endure cultural isolation and discrimination (for being gay, coming from outside Shanghai, and not speaking the Shanghaiese dialect), just as many Asian immigrants and refugees might encounter cultural, racial, and language barriers in the U.S. In turn, these processes and experiences may place stress on the well-being of the individuals, which might result in negative coping mechanisms or health outcomes.

METHODS

Study Population and Sampling Methods

This cross-sectional survey study examines migration characteristics and illicit drug use among two types of male migrants--general male migrants and money boys--in Shanghai, China. To be eligible for the study, participants must have been: (1) aged 18 and above; (2) not native to Shanghai, and (3) able to give verbal and written consent (in Mandarin) to participate. Those who were money boys must have: (1) ever had sex with another man, and (2) self-identified as a money boy at the time of participation. A total of 100 general male migrants and 239 money boys were recruited between April 1, 2006 and June 30, 2006.

A venue-based methodology (construction sites) was used to recruit general male migrants. For the money boys, two recruitment methods were used: (1) a variation of snowball sampling methodology modeled after respondent-driven sampling (or RDS) and (2) use of a community leader who worked for a local nongovernmental organization (NGO) serving MSM in Shanghai. Specifically, the research team selected three seeds--two gay-identified migrant money boys and one non-gay-identified money boy. Each seed was asked to recruit up to three peers, and each eligible participant (excluding the three seeds) was asked to identify (1) the nature of his relationship to the seed, and (2) how long he had known the seed. Although the number of seeds and "waves" of recruitment were somewhat limited due to resource constraints, referrals from one of the gay-identified seeds yielded 130 participants (in seven waves); the other gay-identified seed yielded 41 participants (in three waves). Selection of the non-gay-identified seed resulted in 12 participants (in two waves). The selected community leader was a highly visible member of the gay and MSM community in Shanghai, and highly regarded by members of the local money boy community.

Recruited participants were verbally informed of the nature and purpose of the study, survey procedures, sensitive nature of the questions, confidentiality parameters, payment for participation, risks and benefits (including referrals for other services if needed), and the freedom to cease participation at any time without penalty. After respondents verbally indicated an understanding of these issues, they signed a consent form. They were also given a copy of the Research Subject's Bill of Rights. All consent and human subject forms and procedures had been reviewed by the appropriate academic institutional review boards, Georgetown University in the U.S. and Fudan University in China.

All eligible participants agreed to take part in the study without any expressed reservations. In one instance, an individual (money boy) presented a fake referral coupon. He was subsequently disqualified from participating.

Survey Techniques

As part of a larger study, participants were asked questions regarding (1) demographic information, (2) migration characteristics, and (3) illicit drug use via a self-administered questionnaire. The paper-and-pencil survey took approximately 30 to 75 minutes (and an average of 45 minutes) for participants to complete. A research assistant was onsite to answer any survey-related questions from participants.

Variables

Outcome Variables. Major outcomes included types of illicit drug use. Respondents were asked about their lifetime, past 12-month, and past 30-day use of (1) cocaine;

(2) Ecstasy; (3) heroin; (4) methamphetamine; and (5) other illicit drugs. Hard drug use was classified as having ever used cocaine and/or heroin. Soft drug use was classified as having ever used Ecstasy or methamphetamine. (2)

Predictors: Migrant Characteristics. Measures on the migration model are grouped in three domains: (1) status in hometown (occupation at home and reasons for leaving hometown); (2) migration characteristics (cities traveled to before Shanghai; years away from hometown; time spent in Shanghai; and whether they received a job offer in Shanghai before coming); and (3) current situation in Shanghai (living situation; experience with discrimination; amount of stress felt; satisfaction with life; and depression). Discrimination, life stress, and satisfaction in Shanghai were measured using a single item. Depression was measured by the Center for Epidemiologic Studies Depression Scale (CES-D; Radloff 1977). Cronbach's alpha was .83.

Statistical Analysis

Chi-square analyses were used to test for associations between type of migrant, migration characteristics, and illicit drug use. Logistic regression analyses were used to provide crude odds ratios and examine the independent effects of migration characteristics on illicit drug use. Adjusted odds ratios (OR) and 95% confidence intervals (CI) were computed by using the beta coefficients and standard errors obtained from the multivariable logistic analyses. The multivariable logistic regression was limited to the money boy subgroup, as the number of male migrants who used drugs was extremely low (three of 100 subjects).

RESULTS

Demographic Characteristics

Table 1 shows the demographic characteristics, socioeconomic status, and migration characteristics of participants in this survey study. Compared to the general male migrants, money boys were significantly younger (25.2 vs. 29.9 years old for general male migrants, p = .0002); were more educated (50.6% vs. 25.0% had some high school experience, p = .0001); were more likely to never have been married (89.5% vs. 52.0%, p = .0001); and earned more income (34.7% vs. 8.0% earned 3000 to 4999 RMB Yuan per month [$1 USD = ~7.64 RMB Yuan3], p = .0001).

Money boys cited "no freedom at home" as a major reason for migrating, whereas the general male migrants cited "nothing to do at home." Compared to the general male migrants, money boys were significantly more likely to report less satisfaction with life in Shanghai (22.6% vs. 10.0%) and a higher rate of depression (60.7% vs. 26.0%). This sense of isolation might also be reflected in the fact that money boys are more likely than the general male migrants to live by themselves (46.4% vs. 12.0%, p = .0001). Although money boys reported a shorter stay in Shanghai than the general male migrants, on average money boys had been away from their hometown longer than the general male migrants.

Illicit Drug Use

Only three of the 100 general male migrants self-reported using illicit drugs. As a result, Table 2 presents the prevalence of illicit drug use specifically among money boys. Lifetime use of any illicit drug was 12.1%. Ecstasy appears to be the most popular illicit drug (9.6% lifetime; 5.4% past 12 months; 3.4% past 30 days), followed by cocaine (6.7% lifetime; 4.2% past 12 months; 3.8% past 30 days) and methamphetamine (2.5% lifetime; 1.3% past 12 months; 1.7% past 30 days).

Bivariate Analysis

Table 3 presents the results of a series of bivariate analyses between migrant characteristics and illicit drug use among the two types of male migrants. Money boys had more lifetime illicit drug use than the general male migrants. Income, life satisfaction in Shanghai, and depression were significantly associated with some form of illicit drug use. Interestingly, higher income was associated with lifetime soft-drug use (p = .0000), whereas depression was associated with lifetime drug use.

Multivariable Analysis

Table 4 displays a multivariable logistic regression to look at drug use among money boys (since only three general male migrants reported drug use). Results show that depression was significantly associated with lifetime illicit drug use (OR = 3, 95CI = 1.27-6.68) and lifetime hard-drug use (OR = 6, 95CI = 1.71-20.75), whereas earning a higher income was associated with lifetime illicit drug use (OR = 3.6, 95CI = 1.25-10.36) and lifetime soft-drug use (OR = 5.9, 95CI = 1.65-21.23). Thus, it would appear that higher incomes may promote experimentation with illicit soft drug use, while depression may promote hard-drug use. Indeed, feeling less satisfaction with life in Shanghai was significantly associated with all hard-drug use (OR = 3.4, 95%CI = 1.34-8.49).

DISCUSSION

This is the first quantitative study to systematically examine the influence of numerous factors on illicit drug use among two types of male migrants in a large Chinese city. The "open door" policy that began in 1986 has contributed to the erosion of long-standing taboos associated with the free market, migration, and drug use. The driving force for migration from rural areas to nearby major cities like Shanghai has been primarily economic in nature. With an estimated 121 millions migrants, the Chinese government is rightfully concerned about any potential health crisis or epidemic such as a surge in substance use.

Although the prevalence of illicit drug use among male migrants is very low relative to Western countries, its resurgence after 30 years of strict drug control gives cause for concern. Our overall results are in agreement with recent studies reporting on rising substance use trends, especially among other high-risk groups in China, such as commercial sex workers and male clients (Rogers et al. 2002).

While studies among rural-to-urban migrants are limited, Lin and colleagues (2005) has produced findings that further strengthen the evidence base around Chinese rural-to-urban migrants' substance use and sexual risk behaviors. Data collected from 2,153 participants found that approximately one-third reported having been intoxicated during the previous month. Additionally, these respondents reported higher incidence of depression, less satisfaction with life and work, and finding themselves embedded in a peer group engaging in sexual risk behavior. The study confirmed that respondents reporting substance use, compared to nonusers, were found to be more likely to report purchasing and selling sex, having multiple sex partners and engaging in premarital sex.

The association between higher incomes (and larger amounts of disposable income) and soft drug use found in our study suggests that as people become more affluent, they are more likely to experiment with drug use. Although we were unable to compare illicit drug use between the general male migrants (only three of 100 indicated that they had used drugs) and money boys, our findings suggest that income and illicit drug use among money boys may be related to their profession, which often creates an environment for risky behaviors and provides potential access to soft drugs.

Examining the effects of workplace with income as a predictor of substance use, Chen and colleagues ' (2008) findings resonate with our results. Specifically, analyzing data from 3,752 rural-to-urban migrants, the cross-sectional study found that among male migrants, higher monthly incomes were predictive of increased substance use, particularly for men who worked in nightclubs, construction and small shops. In both that work and our study, workplace-related stress may have contributed to respondents' increased risk for substance use and may be related to feelings of depression as a result.

Illicit drug use aside, depression prevalence was very high among the two types of male migrants in Shanghai. Depression appears to fuel hard drug use, which is consistent with the general literature's observation that these individuals may be using drugs as a form of self-medication (Harris & Edlund 2005; Volkow 2004; Abraham & Fava 1999; Markou, Kosten & Koob 1998). A correlate of depression--life satisfaction in Shanghai--is associated with illicit drug use, as those who feel less satisfied with life in Shanghai use more illicit drugs. It is unclear if depression or life satisfaction in Shanghai is related to an individual's migrant status, which likely relegates him to second-class citizenship in a fast-changing society where he does not directly benefit from the economic boom. In addition to the tendency to live alone, the triple discriminations (e.g., being a rural migrant, gay, and a sex worker) and the lack of family and social support may also contribute to the higher depression rate among money boys.

Differing characteristics among the two types of male migrants clearly demonstrate that migrants in China are not a homogeneous or monolithic group. Future research is needed to examine shared (e.g., high prevalence of depression) and unique (e.g., vocation) characteristics and/or correlates that are associated with drug use and related risk behaviors such as transactional sex.

Limitations of the Study

This study has several limitations. First, because a crosssectional and correlational design was used, causation could not be inferred. Second, the use of a snowball-type sampling or a "truncated" respondent driven sampling (RDS) methodology might restrict generalizability. Third, we were unable to measure pre- and post-migration normative attitudes, beliefs, and behaviors, which prevent validation of Chng and colleagues' model (2003), although the model remains heuristic in understanding illicit drug use. Finally, self-reported measures may underestimate illicit drug use.

Although this study is limited in its generalizability, these limitations do not threaten the validity of the results. With little known about the illicit drug use behaviors of Chinese male rural-to-urban migrants, this study applies a conceptual framework and sampling methodology that highlight the intricately networked characteristic of the sampled population. These findings contribute to the characterization of this special population in China. Informally, the study's success in recruiting 130 participants in seven waves with one seed participant may determine the feasibility of other social network analysis approaches which may help shape future sampling methodologies and prevention interventions focused on this hard-to-reach population. Ideally, future research using a longitudinal design is needed to explore causal relationships involving drug use among rural-to-urban migrants.

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Frank Y. Wong, Ph.D. *; N. He, M.D., Ph.D. **; Z. J. Huang, M.B.B.S., Ph.D., M.P.H. ***; D. Young, B.S. ****; C. O'Conor ***; Y.Y. Ding, M.D. **; C. Fu, M.D. ** & S. Arayasirikul, M.S.P.H., C.H.E.S. *****

([dagger]) This article was supported in part by a National Institute on Drug Abuse grant (R01DA15623-04S1) to the first author while he was affiliated with Georgetown University. The preparation of this article was support in part by the Emory Center for AIDS Research (P30 AI050409), Emory University, the current institutional affiliation of the first author.

* Associate Professor, Department of Behavioral Sciences and Health Education & Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA

** Professor and Vice Chair, Department of Epidemiology, Fudan University, Shanghai, China.

** Lecturer, Department of Epidemiology, Fudan University, Shanghai, China.

*** Associate Professor, Department of International Health, School of Nursing and Health Studies, Georgetown University, Washington, D.C.

*** Undergraduate Student, School of Foreign Services, Georgetown University, Washington, D.C.

**** Associate Analyst, Abt Associates, Washington, D.C.

***** Health Policy & Health Literacy Fellow, Association for Prevention Teaching and Research, Washington, D.C.

NOTES

(1.) In 2003, a judge dismissed a case involving a pimp profiting from a male prostitution operation (involving samesex sexual exchanges) since Chinese laws define prostitution as selling female sex to a male client (Wan 2003).

(2.) Although methamphetamine is often classified as a hard drug due to its addictive and destructive nature, it is perceived to be a soft drug by users in China, and consequently was classified as such in this analysis.

(3.) Exchange rate at the time of data collection.

Please address correspondence and reprint requests to Frank Y. Wong, Ph.D., Department of Behavioral Sciences and Health Education, Rollins School of Public Health, Emory University, 1518 Clifton Road N.E., Room 534, Atlanta, GA 30306; Phone (404) 727-9568; email: fwong3@emory. edu
Many locals caution that bars and saunas here are filled with
   "money boys" on the prowl, mostly needy men from other
   provinces. Stories of blackmail, robbery and thugs abound.
   Cruising areas seem to be more seriously at-your-own-risk
   than elsewhere in Asia. Saunas are traditional public baths--
   small, shabby, and without private spaces. If the men you meet
   don't have a job and come from elsewhere in the country, you
   can assume they are looking for financial assistance.


TABLE 1
Demographics and Migration Characteristics of Male Migrants and
Money Boys in Shanghai, 2006

                                         All             Male Migrants
                                         (N = 339)       (n = 100)
                                         %               %

Demographics
  Age (mean+/- SD)                       26.5+/-7.9      29.9+/-12.0
  Marriage
    Never Married                        78.5            52.0
    Married or Divorced                  21.5            48.0
Education
  Cannot Read                             0.6             0.0
  Elementary                              5.3             7.0
  Middle School                          45.1            66.0
  High School                            43.1            25.0
  College +                               5.6             2.0
Monthly income
  <1000 Yuan                             26.6            39.0
  1000-2999.99 Y                         46.3            53.0
  3000-4999.99 Y                         27.1             8.0
Status at Hometown
  Occupation at Home
    Students                             36.3            41.0
    Small Business                       37.2            31.0
    Farmer                               13.9            22.0
    Looking for Job                      12.6             6.0
Reasons for Leaving Hometown
    (multiple choices)
  Earn more Income                       56.1            50.0
  No Freedom at Home                     12.4             6.0
  Nothing to do at Home                   6.8            13.0
  Want to see the World                  35.4            38.0
Migration Experience
  Cities went to before Shanghai
    None                                 29.0            37.4
    1 to 2                               43.4            40.4
    3 to 5                               23.7            19.2
    >=6                                   3.9             3.0
  Years away from Home
    0 to 1                                7.6            15.2
    2 to 5                               31.7            23.9
    6 to 9                               42.4            30.4
    10+                                  18.4            30.4
  Time in Shanghai
    <3 Months                            28.6            16.0
    3-6 Months                           31.6            27.0
    7-12 Months                          39.8            57.0
  Had a Job before coming to Shanghai
    Yes                                  34.5            64.0
    No                                   65.5            36.0
Current Situation in Shanghai
  Live with
    Alone                                36.3            12.0
    Co-worker or Friends                 46.3            61.0
    Partner or Spouse                    10.6            16.0
    Other                                 6.8            11.0
  Discrimination
    Yes                                  52.8            52.0
    No/ Don't Know                       47.2            48.0
  Life in Shanghai is Stressful
    Yes                                  36.3            29.0
    No/ Don't Know                       63.7            71.0
  Satisfied with Life in Shanghai?
    No                                   18.9            10.0
    Yes/Doesn't Matter                   81.1            90.0
  Depression (CESD score > 16)
    Yes                                  50.4            26.0
    No                                   49.6            74.0

                                         Money Boy
                                         (n = 239)
                                         %                  p-value

Demographics
  Age (mean+/- SD)                       25.2+/-4.7         0.0002
  Marriage
    Never Married                        89.5               <0.0001
    Married or Divorced                  10.5
Education
  Cannot Read                             0.8               <0.0001
  Elementary                              4.6
  Middle School                          36.4
  High School                            50.6
  College +                               7.1
Monthly income
  <1000 Yuan                             21.3               <0.0001
  1000-2999.99 Y                         43.5
  3000-4999.99 Y                         34.7
Status at Hometown
  Occupation at Home
    Students                             34.3               0.0028
    Small Business                       39.8
    Farmer                               10.5
    Looking for Job                      15.5
Reasons for Leaving Hometown
    (multiple choices)
  Earn more Income                       58.6               0.1468
  No Freedom at Home                     15.1               0.0209
  Nothing to do at Home                   4.2               0.0032
  Want to see the World                  34.3                0.517
Migration Experience
  Cities went to before Shanghai
    None                                 25.5                0.164
    1 to 2                               44.7
    3 to 5                               25.5
    >=6                                   4.3
  Years away from Home
    0 to 1                                4.5               <0.0001
    2 to 5                               34.8
    6 to 9                               47.3
    10+                                  13.4
  Time in Shanghai
    <3 Months                            33.9               <0.0001
    3-6 Months                           33.5
    7-12 Months                          32.6
  Had a Job before coming to Shanghai
    Yes                                  22.2               <0.0001
    No                                   77.8
Current Situation in Shanghai
  Live with
    Alone                                46.4               <0.0001
    Co-worker or Friends                 40.2
    Partner or Spouse                     8.4
    Other                                 5.0
  Discrimination
    Yes                                  53.1               0.8482
    No/ Don't Know                       46.9
  Life in Shanghai is Stressful
    Yes                                  39.3               0.0712
    No/ Don't Know                       61.7
  Satisfied with Life in Shanghai?
    No                                   22.6               0.0069
    Yes/Doesn't Matter                   77.4
  Depression (CESD score > 16)
    Yes                                  60.7               <.0001
    No                                   39.3

TABLE 2

Prevalence of Substance Use among Money Boys (N = 239) in Shanghai,
2006

                                   Ever Use        Past 30 Days

                               N        %        N        %

Any Drugs or Stimulants        29       12.1     N/A      N/A
Cocaine                        16       6.7      9        3.8
Ecstasy                        23       9.6      8        3.4
Heroin (White Powder)          5        2.1      1        0.4
Ice [Toxic]/Methamphetamine    6        2.5      4        1.7
Other Drugs                    6        2.5      2        0.8

                                Past 12 Months

                               N

Any Drugs or Stimulants        N/A      N/A
Cocaine                        10       4.2
Ecstasy                        13       5.4
Heroin (White Powder)          2        0.8
Ice [Toxic]/Methamphetamine    3        1.3
Other Drugs                    3        1.3

Note: Among 100 male migrants (non-money boys) in the study, three
had ever used drugs.

TABLE 3
Association between Migration Variables and Substance Use among Male
Migrants and Money Boy in Shanghai, China 2006

                                            Ever Use Drugs

                                            (%)        (p-value)

Demographics

Age
  18-24                                      7.6         0.1648
  25+                                       12.1
Marriage
  Never Married                              9.9         0.6847
  Married or Divorced                        8.3
Education
  Cannot Read                               50.0         0.1098
  Elementary                                17.7
  Middle School                             10.5
  High School                                8.4
  College+                                   0.0
Monthly Income
  <1000 Yuan                                 5.7         0.0067
  1000-2999.99 Yuan                          6.5
  3000-4.999.99 Yuan                        19.1
Occupation at Home
  Students                                   5.7         0.1465
  Small Business                            13.8
  Farmer                                     6.4
  Looking for a Job                         11.9

Migration Experience

Reasons for Leaving
  Earn more Income
    Yes                                      9.6         0.9750
    No                                       9.5
  No Freedom at Home
    Yes                                     12.5         0.5639
    No                                       9.2
  Nothing to do at Home
    Yes                                      4.4         0.7108
    No                                      10.0
  Want to see the World
    Yes                                     13.6         0.0679
    No                                       7.4
Number of Cities went to before Shanghai
  0 / None                                   5.2         0.2099
  1 to 5                                    11.2
  >=6                                       14.3
Years away from Home
  0-5                                        4.9         0.0292
  6+                                        12.2
Time in Shanghai
  <3 Months                                  8.3         0.8777
  3-6 Months                                10.4
  7-12 Months                                9.9
Had a Job before coming to Shanghai
  Yes                                        7.8         0.4298
  No                                        10.5

Current Situation in Shanghai

Live with
  Alone                                      9.0         0.9562
  Coworker/Friend/Partner/Spouse            10.0
  Other                                      9.1
Do you feel Discriminated against?
  Yes                                       11.4         0.2427
  No/Don't Know                              7.6
Is Life in Shanghai Stressful?
  Yes                                        9.9         0.8749
  No/Don't Know                              9.4
Are you Satisfied with Life in Shanghai?
  Yes                                       17.2         0.0215
  No                                         7.8
Is Money Boy or General Male Migrant
  Money Boy                                 12.3         0.0091
  GMM                                        3.1
Depression (CESD Score >= 16)
  Yes                                       14.3         0.0033
  No                                         4.8

                                            Ever Use Hard Drug

                                            (%)        (p-value)

Demographics

Age
  18-24                                      5.2         0.3813
  25+                                        7.5
Marriage
  Never Married                              5.6         0.4156
  Married or Divorced                        8.2
Education
  Cannot Read                               50.0         0.2049
  Elementary                                 5.6
  Middle School                              7.2
  High School                                5.5
  College+                                   0.0
Monthly Income
  <1000 Yuan                                 4.4         0.1622
  1000-2999.99 Yuan                          4.5
  3000-4.999.99 Yuan                        11.1
Occupation at Home
  Students                                   4.1         0.2349
  Small Business                             8.7
  Farmer                                     2.1
  Looking for a Job                          9.3

Migration Experience

Reasons for Leaving
  Earn more Income
    Yes                                      6.3         0.9168
    No                                       6.0
  No Freedom at Home
    Yes                                      9.5         0.3109
    No                                       5.7
  Nothing to do at Home
    Yes                                      4.4         1.0000
    No                                       6.3
  Want to see the World
    Yes                                     10.0         0.0314
    No                                       4.1
Number of Cities went to before Shanghai
  0 / None                                   3.1         0.3116
  1 to 5                                     7.5
  >=6                                        7.1
Years away from Home
  0-5                                        3.2         0.1278
  6+                                         7.3
Time in Shanghai
  <3 Months                                  5.2         0.2566
  3-6 Months                                 9.4
  7-12 Months                                4.4
Had a Job before coming to Shanghai
  Yes                                        6.8         0.7215
  No                                         5.9

Current Situation in Shanghai

Live with
  Alone                                      3.3         0.1803
  Coworker/Friend/Partner/Spouse             8.3
  Other                                      4.4
Do you feel Discriminated against?
  Yes                                        7.8         0.1888
  No/Don't Know                              4.4
Is Life in Shanghai Stressful?
  Yes                                        7.3         0.5177
  No/Don't Know                              5.6
Are you Satisfied with Life in Shanghai?
  Yes                                       14.1         0.0078
  No                                         4.4
Is Money Boy or General Male Migrant
  Money Boy                                  8.0         0.0463
  GMM                                        2.0
Depression (CESD Score >= 16)
  Yes                                       10.5         0.0008
  No                                         1.8

                                            Ever Use Soft Drug

                                            (%)        (p-value)

Demographics

Age
  18-24                                      6.3         0.2982
  25+                                        9.4
Marriage
  Never Married                              8.3         0.4273
  Married or Divorced                        5.5
Education
  Cannot Read                               50.0         0.1975
  Elementary                                11.1
  Middle School                              7.8
  High School                                7.5
  College+                                   0.0
Monthly Income
  <1000 Yuan                                 3.3         0.0009
  1000-2999.99 Yuan                          4.5
  3000-4.999.99 Yuan                        17.8
Occupation at Home
  Students                                   5.7         0.6021
  Small Business                            10.3
  Farmer                                     6.4
  Looking for a Job                          7.0

Migration Experience

Reasons for Leaving
  Earn more Income
    Yes                                      7.9         0.8604
    No                                       7.4
  No Freedom at Home
    Yes                                     11.9         0.3460
    No                                       7.1
  Nothing to do at Home
    Yes                                      4.4         1.0000
    No                                       7.9
  Want to see the World
    Yes                                     10.0         0.2327
    No                                       6.4
Number of Cities went to before Shanghai
  0 / None                                   5.1         0.3800
  1 to 5                                     8.4
  >=6                                       14.3
Years away from Home
  0-5                                        4.0         0.0547
  6+                                         9.9
Time in Shanghai
  <3 Months                                  8.3         0.8687
  3-6 Months                                 6.5
  7-12 Months                                8.2
Had a Job before coming to Shanghai
  Yes                                        6.0         0.3969
  No                                         8.6

Current Situation in Shanghai

Live with
  Alone                                      7.3         0.9711
  Coworker/Friend/Partner/Spouse             7.8
  Other                                      8.7
Do you feel Discriminated against?
  Yes                                        9.5         0.1811
  No/Don't Know                              5.6
Is Life in Shanghai Stressful?
  Yes                                        7.3         0.8540
  No/Don't Know                              7.9
Are you Satisfied with Life in Shanghai?
  Yes                                       12.5         0.1189
  No                                         6.6
Is Money Boy or General Male Migrant
  Money Boy                                  2.0         0.0121
  GMM                                       10.0
Depression (CESD Score >= 16)
  Yes                                       10.5         0.0461
  No                                         4.8

Note. P-values were obtained from Chi-square tests or Fisher's tests
as appropriate.

TABLE 4

Adjusted Odds Ratios of Migration Factors Associated with Substance
Use in Money Boys (N = 239) in Shanghai, China, 2006

Effect                                      Ever Use Drug
Depression (CES-D score >=16)
  Yes                                       3 (1.27-6.88)

  No                                        ref
Income
  Low                                       ref
  Median                                    1.1 (0.38-3.50)
  High                                      3.6 (1.25-10.36)
Migration Variables
  Want to see the world
    Yes                                     2 (1.0-4.30)
    No                                      ref
Migration Variables
  Years away from home
    0-5 years                               ref
    6+ years                                2.7 (1.05-6.96)
Migration Variables
  Are you satisfied with life in Shanghai
    Yes                                     ref
    No                                      2.3 (1.02-5.13)

Effect                                      Ever Use Hard Drug
Depression (CES-D score >=16)
  Yes                                       6.0 (1.71-20.75)
  No                                        ref
Income
  Low                                       ref
  Median                                    1.0 (0.28-3.55)
  High                                      2.3 (0.68-7.80)
Migration Variables
  Want to see the world
    Yes                                     2.7 (1.08-6.60)
    No                                      ref
Migration Variables
  Years away from home
    0-5 years                               ref
    6+ years                                2.31 (0.74-7.24)
Migration Variables
  Are you satisfied with life in Shanghai
    Yes                                     ref
    No                                      3.4 (1.34-8.49)

Effect                                      Ever Use Soft Drug
Depression (CES-D score >=16)
  Yes                                       2.0 (0.83-4.85)
  No                                        Ref
Income
  Low                                       Ref
  Median                                    1.4 (0.34-5.43)
  High                                      5.9 (1.65-21.23)
Migration Variables
  Want to see the world
    Yes                                     1.7 (0.74-3.91)
    No                                      Ref
Migration Variables
  Years away from home
    0-5 years                               Ref
    6+ years                                2.6 (0.93-7.34)
Migration Variables
  Are you satisfied with life in Shanghai
    Yes                                     ref
    No                                      1.8 (0.73-4.55)
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