|Is generalized maternal optimism or pessimism during pregnancy associated with unplanned cesarean section deliveries in China?|
|Jump to Full Text|
|PMID: 21490743 Owner: NLM Status: MEDLINE|
|This research examines whether maternal optimism/pessimism is associated with unplanned Cesarean section deliveries in China. If so, does the association remain after controlling for clinical factors associated with C-sections? A sample of 227 mostly primiparous women in the third trimester of pregnancy was surveyed in a large tertiary care hospital in Beijing, China. Post-delivery data were collected from medical records. In bivariate analysis, both optimism and pessimism were related to unplanned c-section. However, when optimism and pessimism were entered into a regression model together, optimism was no longer statistically significant. Pessimism remained significant, even when adjusting for clinical factors such as previous abortion, previous miscarriage, pregnancy complications, infant gestational age, infant birthweight, labor duration, birth complications, and self-rated difficulty of the pregnancy. This research suggests that maternal mindset during pregnancy has a role in mode of delivery. However, more research is needed to elucidate potential causal pathways and test potential interventions.|
|Cheryl A Moyer; Yasmin Elsayed; Yuchun Zhu; Yumei Wei; Cyril M Engmann; Huixia Yang|
Related Documents :
|21534753 - The use of the sisterhood method for estimating maternal mortality ratio in lagos state...
3184163 - Progesterone levels during pregnancy in the greater thick-tailed galago (galago crassic...
18446533 - Pre-pregnancy body mass index and weight gain during pregnancy in relation to preterm d...
|Type: Journal Article; Research Support, N.I.H., Extramural Date: 2011-01-05|
|Title: Journal of pregnancy Volume: 2010 ISSN: 2090-2735 ISO Abbreviation: J Pregnancy Publication Date: 2010|
|Created Date: 2011-04-14 Completed Date: 2013-05-24 Revised Date: 2013-06-30|
Medline Journal Info:
|Nlm Unique ID: 101553823 Medline TA: J Pregnancy Country: Egypt|
|Languages: eng Pagination: 754938 Citation Subset: IM|
|Global REACH, Medical School, University of Michigan, 5115 Med Sci 1, 1301 Catherine Street, Ann Arbor, MI 48109, USA. email@example.com|
|APA/MLA Format Download EndNote Download BibTex|
Attitude to Health / ethnology*
Cesarean Section / statistics & numerical data*
Pregnant Women / psychology*
|T37 MD001425-08/MD/NIMHD NIH HHS|
Journal ID (nlm-ta): J Pregnancy
Journal ID (publisher-id): JP
Publisher: Hindawi Publishing Corporation
Copyright © 2010 Cheryl A. Moyer et al.
Received Day: 6 Month: 10 Year: 2010
Accepted Day: 8 Month: 12 Year: 2010
Print publication date: Year: 2010
Electronic publication date: Day: 5 Month: 1 Year: 2011
Volume: 2010E-location ID: 754938
PubMed Id: 21490743
|Is Generalized Maternal Optimism or Pessimism During Pregnancy Associated with Unplanned Cesarean Section Deliveries in China?|
|Cheryl A. Moyer1, 2, 3I2I3*|
|Yasmin Elsayed1, 2I2|
|Cyril M. Engmann5|
|Huixia Yang2, 4I4*|
1Global REACH, Medical School, University of Michigan, 5115 Med Sci 1, 1301 Catherine Street, Ann Arbor, MI 48109, USA
2Minority and Health Disparities International Research Training Program (MHIRT), Center for Human Growth and Development, University of Michigan, MI 48109, USA
3Department of Medical Education, Medical School, University of Michigan, MI 48109, USA
4Department of Obstetrics and Gynecology, Peking University First Hospital, 8 Xishiku Street, Xicheng District, Beijing 100034, China
5Division of Neonatal-Perinatal Medicine, Department of Pediatrics, University of North Carolina at Chapel Hill, CB 7596, 4th Floor, UNC Hospitals, Chapel Hill, NC 27599-7596, USA
|Correspondence: *Cheryl A. Moyer: firstname.lastname@example.org and
Correspondence: *Huixia Yang: email@example.com
[other] Academic Editor: Sean Blackwell
Worldwide, Cesarean section rates are increasing [1–3]. Despite recommendations that cesarean section rates not exceed 15% [4, 5], many countries have rates double or even triple that threshold . China—home to one-fifth of the world's population and 12 percent of all births annually [6, 7]—is no different. Data from hospital-based studies in urban China showed c-section rates ranging from 26% to 63% during the late 1990s , while a more recent WHO study combining urban and rural populations reported overall c-section rates of 46.2% .
Although cesarean section deliveries can be lifesaving for both mothers and their infants when indicated, their overuse is cause for concern due to their association with increased maternal morbidity and mortality, cost, and utilization of sometimes scarce health system resources . Numerous researchers have investigated the predictors of higher than normal cesarean section rates [9–15]. Principal among these include including physician-related factors, insurance-related factors, hospital and health-system factors, and maternal preferences. Additionally, cesarean section rates have also been found to vary by male versus female provider , public versus private hospital setting [16–19], adoption and use of clinical guidelines , public versus private insurance status , and even day of the week and time of day [17, 19, 21] that women present for delivery. Patient race , age , income , and preferences  have also been linked to increased c-section rates.
Although the literature is replete with clinical factors associated with elective and emergency cesarean section, such as advanced maternal age, short maternal stature, heavier infant birthweight, fetal dystress, preeclampsia, prolonged/obstructed labor, or shoulder distocia [8, 24], less is known about psychological factors that affect women who intend to delivery vaginally but ultimately deliver via c-section. It is probable that the vast majority of unplanned cesarean sections are attributable to clinical indications. However, are there potential psychological variables at play as well? And in a country like China, with exceedingly high rates of cesarean section, might the impact of those psychological variables be observable?
This exploratory study was designed to examine the psychological characteristic of dispositional optimism and pessimism in a woman's likelihood of undergoing an unplanned cesarean section delivery in urban China. Dispositional optimism is seen as a relatively stable personality characteristic (a “trait” rather than a “state”) that is associated with general assumptions about positive future outcomes. Dispositional pessimism is the converse: it is a tendency to expect the worst when looking toward future outcomes. A meta-analytic review of the optimism literature from 2009  that examined 83 separate studies found a persistent relationship between optimism and positive health outcomes . In addition, women with higher levels of optimism during pregnancy have been found to have to lower levels of stress, anxiety, and peripartum depression than women with lower levels of optimism [26–29]. Optimism has also been linked to birth outcomes, with one study finding that optimistic women gave birth to larger babies , and a second study finding that when gestational age was controlled for, women who were least optimistic during pregnancy when compared to women with higher levels of optimism delivered smaller infants .
It may seem logical to conclude that if optimism can lead to better health outcomes, pessimism might be detrimental. However, pessimism has been shown to have prophylactic effects in certain circumstances. In particular, pessimism can insulate people from the psychological consequences of failure, including anxiety, depression, and diminished self-esteem . Norem and Cantor [32, 33] found that individuals who expect the worst can sometimes use those expectations to help them better meet the demands of stressful challenges. These “defensive pessimists” engage in active and constructive coping efforts—which may mediate the relationship between pessimism and outcomes . For example, Moyer et al. found that among pregnant women in Ghana, those who were the most pessimistic were more likely to get tested for HIV whereas their optimistic counterparts were less likely to get tested .
This research aimed to address the following research questions. (1) Is generalized maternal optimism or pessimism (assessed during pregnancy) associated with unplanned cesarean section among women giving birth in a tertiary care hospital in Beijing? (2) If optimism or pessimism is associated with unplanned cesarean section, which is more strongly associated, optimism or pessimism? And (3) if there is a significant relationship between optimism, pessimism, and unplanned cesarean section delivery, is that relationship robust enough to remain significant when clinical factors are included in the model?
Data were collected from pregnant women presenting for prenatal care at the obstetric outpatient clinic at the Peking University First Hospital between May and July 2006. As one of the largest and most well-known academic medical centers in Beijing, Peking University First Hospital draws both public and private patients from in and around Beijing. Clinics see an average of 600 pregnant women per week and 3000–3500 deliveries per year.
All research protocols and survey instruments were reviewed and approved by the institutional review boards at the University of Michigan and Peking University.
Pregnant women in their last trimester of pregnancy who were 18 years old or older attending antenatal care clinic were eligible. Women facing an imminent health crisis, those in active labor, or those being admitted to the hospital were excluded (despite the generally stable nature of optimism and pessimism, those women in active labor were excluded because of concerns about disproportionate reporting of a pessimistic attitude if it was assessed during painful, active labor when compared to assessments obtained during a routine prenatal visit). After describing the study and obtaining verbal approval to continue, research assistants talked patients through an informed consent form, answering any questions the women may have had. All participants signed a written informed consent document and were given a copy to keep. Women were then given a self-administered survey to complete before their appointment. Translators were used when necessary. Surveys were designed to be self-administered, but women were given the option to have the survey administered verbally.
Data were gathered using paper and pencil forms. Hospital registration numbers were collected from participants to allow for postdelivery followup. Hospital registration numbers were removed from the original survey and replaced with a unique ID number once the registration number was recorded in a separate location for follow-up purposes. Responses from the hard copies of the self-administered surveys were entered into an Excel spreadsheet and cleaned.
The survey included administering a demographic and health questionnaire and the Life Orientation Test (LOT-R).
The Demographic and Health Questionnaire measured patient characteristics including age, number of pregnancies, other medical conditions, and self-perceived health status. Women were asked to enumerate any pregnancy complications or symptoms they had during pregnancy, including such things as vaginal bleeding, headaches, swollen hands, troubled vision, preeclampsia, dizzy spells, swollen face, abdominal/belly pain, eclampsia, or other problems. For the purposes of this analysis, these were combined into a single dichotomous variable, and termed maternal complications. Women were also asked to rate their perception of the difficulty of their pregnancy on a scale of 1 to 4, with 1 being “extremely easy” and 4 being “extremely difficult.”
The Life Orientation Test (LOT), developed by Sheier and Carver in 1985  and revised in 1994  (Life Orientation Test—Revised, or LOT-R), was used to assess dispositional optimism. The LOT-R is one of the most commonly used measures of optimism/pessimism. It uses generalized outcome expectancies to measure dispositional optimism. The LOT-R has been widely validated  and used in China [39–46]. It includes 6 scored items and 4 fillers that generate an overall score, as well as two possible subscales: an optimism subscale and a pessimism subscale. The items that make up the optimism subscale are (1) in uncertain times, I usually expect the best; (2) I'm always optimistic about my future and (3) overall, I expect more good things to happen to me than bad. The items that make up the pessimism subscale are (1) if something can go wrong for me, it will; (2) I hardly ever expect things to go the way I would like them to go; (3) I rarely count on good things happening to me. The participant answers each item based on a 5-point scale, with response options ranging from strongly disagree to strongly agree. The pessimism items are reverse scored and then added to the optimism items to create the overall score whereas the subscales are created by summing the items for pessimism and the items for optimism separately. For these analyses, the optimism and pessimism subscales were used separately.
The instrument was pilot tested, and minor modifications were made to ensure comprehension. The survey was translated into Mandarin and back-translated into English by native bilingual speakers. The original and back-translated versions were compared for consistency, and any inconsistencies were resolved by discussion and consensus among the research team.
was used to collect data after women had delivered their babies. Mode of delivery was determined, which indicated vaginal delivery with and without forceps, vaginal delivery with and without vacuum extraction, planned cesarean section, or unplanned cesarean section. For the purposes of this analysis, a single dichotomous variable was created to reflect unplanned cesarean section yes/no. Thus women who delivered vaginally or via planned cesarean section were treated as one group, and women undergoing an unplanned or emergency cesarean section were treated as a separate group. Additional data collected from the medical record included gestational age of the infant at delivery, birthweight, labor duration, use of pain medication, 1-minute and 5-minute Apgar scores, and any of a number of delivery or birth complications, including such things as hemorrhage, preeclampsia, intrauterine infection, breech presentation, or delayed labor. For the purposes of this analysis, all of those factors were combined into a single dichotomous variable termed birth complications.
Chart review Data were entered into a spreadsheet and cleaned. All data were analyzed using SPSS statistical software, Version 17.1 (SPSS Inc, Chicago, IL). Frequencies and basic descriptive statistics were calculated for all variables. Women with complete baseline and chart data (and could thus be included in the larger regression analysis) were compared against those women with incomplete baseline or chart data using Student's t-test for continuous variables and Chi Square analysis for categorical variables.
To address Research Question 1, (is optimism or pessimism associated with unplanned cesarean section delivery?), bivariate statistics were calculated to determine if optimism or pessimism were independently associated with unplanned cesarean section. Additional demographic and clinical variables were examined to determine if there were factors aside from optimism and pessimism and expected clinical correlates that might be associated with unplanned cesarean section in this population. Bivariate analysis included Student's t-tests, ANOVAs, and Chi-Square analyses.
To address Research Question 2, (which is more strongly associated with unplanned cesarean section delivery, optimism or pessimism?) Binary logistic regression analysis was conducted with both optimism and pessimism regressed on unplanned cesarean section (yes/no). Area under the curve analysis was conducted to judge the strength of the model.
To address Research Question 3, (if there is a significant relationship between optimism, pessimism, and unplanned cesarean section delivery, is that relationship robust enough to remain significant when clinical factors are included in the model?), binary logistic regression analysis was conducted with optimism and pessimism regressed on unplanned cesarean section (yes/no) with the additional clinical factors of labor duration, birth complications, previous abortion, previous miscarriage, pregnancy complications, gestational age, infant birth weight, and self-rated difficulty of the pregnancy added into the model. Area under the curve analysis was conducted to judge the strength of the model.
For all analyses a P value of .05 was taken as statistically significant.
Two hundred fifty-one women were asked to participate, and 227 met our eligibility criteria and agreed to participate (90.4% response rate). Of the 227, 86 had missing items on their surveys or their birth outcomes data were not available in the hospital medical records system. Table 1 illustrates our sample demographics, comparing the 141 women who were ultimately included in our analysis with the 86 who were excluded. Overall, our sample is one of well-educated Han women in their last trimester of pregnancy who are married and working outside the home. They do not differ significantly from the 86 women excluded from the analysis on any variable aside from education, with excluded women more likely to have lower levels of education (P = .012).
Table 2 illustrates the health-related variables reported at enrollment. Again, there were no significant differences found between women included in our analysis and those excluded due to missing data. More than half of our sample has had at least one previous pregnancy that was either spontaneously or electively terminated, and only 2.8 percent of women report having anything other than mild complications in this current pregnancy. The vast majority of women in this study were primiparous.
Table 3 reflects delivery data obtained via chart review. Mean gestational age at delivery was 39.6 weeks. Mean duration of labor—defined as the time from first documentation of regular contractions plus cervical dilation to vaginal delivery—was 9 hours, with a range of 1 to 21 hours. Slightly more than half of women delivered vaginally, with the remaining having planned, emergency, or posttrial-of-labor (PTOL) cesarean sections. Infants had a mean gestational weight of 3406 grams, and most had five-minute Apgar scores of 10.
Forty-one percent of women had at least one birth complication. The most common complications were fetal distress (41%), preterm membrane rupture (26%), umbilical cord issues such as prolapsed, entanglement or nuchal cords (17%), and delayed labor (7%).
With regard to Research Question 1, (is optimism or pessimism associated with unplanned cesarean section delivery?), bivariate analyses comparing optimism and pessimism against unplanned cesarean section indicated that both were significant: optimism (P = .047, 95% CI. 012, 1.81), pessimism (P = .003; 95% CI −2.42, −.529) (See Table 4). In addition, labor duration (P = .004, 95% CI 1. 009, 5.16) and the presence of birth complications (P = .01, Chi Square = 6.65) were also found to be significant. No other demographic or clinical factors were significantly associated with unplanned cesarean section.
Table 5 Model 1, illustrates the findings with regard to Research Question 2 (which is more strongly associated with unplanned cesarean section delivery, optimism or pessimism?). In an unadjusted model in which both optimism and pessimism were regressed against unplanned cesarean section, pessimism remained statistically significant while optimism failed to meet the threshold for statistical significance. (pessimism OR = 1.28, 95% CI: 1.06, 1.56, P = .01; optimism OR = 0.88, 95% CI: 0.71, 1.08; P = .22).
When the same model was then adjusted for a variety of clinical factors (see Table 5 Model 2) to answer Research question 3 “if there is a significant relationship between optimism, pessimism, and unplanned cesarean section delivery, is that relationship robust enough to remain significant when clinical factors are included in the model?”, pessimism remained significantly associated with unplanned cesarean section (OR = 1.42; 95% CI: 1.11, 1.81; P = .004). Of note, labor duration and birth complications (preeclampsia, intrauterine infection, breech presentation, delayed labor, etc.) were the only clinical factors in the adjusted model that had a significant relationship to unplanned cesarean section delivery.
This study showed an association between higher levels of generalized maternal pessimism during pregnancy and an increased likelihood of an unplanned c-section delivery among women presenting for prenatal care and delivering their infants at a tertiary care hospital in Beijing, China. This association was robust enough to remain, even when adjusted for clinical factors likely to be linked to a risk of unplanned cesarean section delivery. Interestingly, pessimism not optimism remained significant throughout the analysis.
However, what is not clear, and what the cross-sectional study design of the study does not allow us to explore, is the mechanism of action. What is it about being pessimistic that is related to unplanned c-section delivery? It is possible that pessimists have qualitatively different or less effective coping skills than their less pessimistic counterparts [47–50]. Additionally pessimists, by virtue of believing that negative outcomes are likely, may be more fearful during labor. Emotional factors such as fear of delivery or fear of pain  have been linked to increased risk of c-section. Pessimists may also be more likely than their optimistic counterparts to abandon a traditional vaginal delivery and opt for a c-section if given the opportunity. Conceivably pessimism may serve as a proxy for another latent variable. Previous studies have linked optimism and pessimism to age, spirituality, and even SES, [52–54] but an additional, as yet undescribed and measured variable could explain the relationship between pessimism and unplanned cesarean section rates.
By contract, optimists have been found to be more likely to adopt active coping strategies and reappraise a situation in a positive way if an important goal is blocked . It is possible that such coping strategies may allow optimists to relax during delivery more easily than their more pessimistic peers, reducing the likelihood of “failure to progress.” Our findings do not support this possibility: pessimism showed a significant association with unplanned cesarean section deliveries, while levels of optimism did not. This is not only useful in reaffirming that optimism and pessimism are two separate constructs rather than poles on a continuum [55, 56], but is also instructive in potential interventions during pregnancy. Encouraging positive thoughts may not be nearly as helpful as discouraging negative ones.
The idea that cognitive predispositions that precede delivery may be associated with type of delivery is worthy of further exploration—including whether interventions can be designed to influence women's predispositions. For example, could cognitive behavioral therapy be used to reframe pessimists' negative thoughts, and might that result in lower cesarean-section rates? Perhaps more fundamentally, can pessimism be unlearned?
Despite a dearth of information on pessimism, research suggests that optimism can be learned and practiced . Avoiding negative environments, seeking the company of positive individuals and reframing challenges as opportunities are some of the ways experts suggest “activating” one's optimism . Yet it is unclear whether such techniques would be effective enough to impact health outcomes.
Nevertheless, our findings are noteworthy for two reasons. First, they demonstrate the potential relationship/association between psychological factors assessed during pregnancy and eventual delivery outcomes, and second, they illustrate the potential strength of psychological factors such as pessimism.
That birth complications were significantly associated with unplanned cesarean sections is to be expected—given that complications such as fetal distress, preeclampsia, prolonged/obstructed labor, or shoulder dystocia are primary indications for cesarean section delivery [8, 24]. It is also not surprising that duration of labor is associated with unplanned cesarean section. We also observed that women who delivered vaginally in this sample had longer labors than those who had unplanned cesarean sections (data not shown). It was interesting to note that in this study the length of time women were allowed to attempt labor before a cesarean section was chosen was much shorter than in the United States (average unplanned cesarean section labor duration in this study was 3.5 hours, compared to 16.0 hours among nulliparas and 12.4 hours among multiparas in the United States ).
There are several limitations to this study. First, the use of the LOT-R has not been formally validated among Chinese pregnant women. However, the instrument has been used repeatedly in China [39–46, 59] and it was carefully pretested in this population prior to study implementation. Our focus groups and pilot testing did not indicate any difficulties in interpretation of these items. Nonetheless, the instrument may benefit from a more rigorous validation study in this population. Also, the use of a cross-sectional convenience sample that includes mostly primiparous women limits inference to a wider population of pregnant Chinese women. In this study, all women presenting to the clinic were asked to participate, and it is possible that the women presenting during this study period were different from the larger population of pregnant women in Beijing. Future studies would benefit from a design that includes random selection at a variety of institutions across Beijing and across China.
This study also includes women in their last trimester of pregnancy. Although optimism/pessimism is considered a stable construct, it would be valuable to determine the potential impact of earlier recruitment.
This study also reveals what some would call excessively high episiotomy, cesarean section, and forceps rates, limiting its generalizability to settings without similar rates. Nonetheless, we believe these findings reflect clinical practice at one large tertiary care center in China, and as such provide valuable insight.
Finally, this study asked women to self-report their pregnancy complications. It was not possible to verify these self-reports against medical records data. We were able to elicit birth complications from the medical record, but this study relies upon self-reported complications during the gestation period. We do not believe this to be a significant limitation, however, given the high probability that women will know whether they are experiencing nausea, vomiting, or abdominal pain, or whether they have vaginal bleeding or swollen hands and feet. We also expect that women will remember if a doctor has told them they have high blood pressure, gestational diabetes, or other more serious pregnancy complications.
This research has several important implications. First, it confirms what many women and practitioners may have believed anecdotally: that a woman's mindset during her pregnancy may have an impact on her delivery. It also raises questions about the value of positive thinking—the predominant advice given to pregnant women—versus the value of not thinking negatively. Second, it raises important questions about whether inexpensive cognitive behavioral therapy or other mindset-altering interventions among pregnant women could be used to reduce unplanned cesarean section rates.
More research is needed to elucidate the relationship between pessimism and pregnancy outcomes. Is this study replicable? Is the finding real, or is it masking some other yet to be determined variable? Is a negative outlook merely associated with a risk of unplanned cesarean section delivery, or can a causal pathway be identified? In addition, is it possible to change women's levels of pessimism? And would interventions to decrease pessimism translate to reduced rates of c-sections?
These are just some of the questions in need of answers as researchers continue to explore the relationship between psychosocial variables and pregnancy outcomes.
Current Knowledge on This Subject
- Cesarean section rates are rising, due, in large part, to nonclinical factors.
- Physician factors, insurance status, hospital policies, and maternal preferences are all non-clinical factors that influence csection rates.
- Maternal cognitive predispositions during pregnancy (specifically optimism/pessimism) have not been examined in relationship to unplanned cesarean section deliveries.
What This Study Adds
- Pessimism during pregnancy appears to be associated with an increased risk of unplanned cesarean section delivery in this population.
- Pessimism during pregnancy remains associated even when clinical factors are controlled.
- Pessimism appears to be a stronger correlate than optimism—suggesting that having positive thoughts/expectations may not be as helpful as not having negative thoughts/expectations during pregnancy.
The project/study described was supported by Grant no.T37 MD001425-08, from the National Center of Minority Health and Health Disparities, National Institutes of Health. Its contents, including the design and conduct of the study, the collection, management, analysis and interpretation of the data, and the preparation, review, and approval of the paper, are solely the responsibility of the authors and do not necessarily represent the official views of the National Institutes of Health. No author has a financial conflict of interest in this research or in its publication.
The authors would like to thank clinic staff at the outpatient obstetrics and gynecology clinic at Peking University First Hospital for their assistance with this research.
|1.||Stanton CK,Holtz SA. Levels and trends in cesarean birth in the developing worldStudies in Family PlanningYear: 2006371414816570729|
|2.||Villar J,Valladares E,Wojdyla D,et al. Caesarean delivery rates and pregnancy outcomes: the 2005 WHO global survey on maternal and perinatal health in Latin AmericaThe LancetYear: 2006367952518191829|
|3.||Lumbiganon P,Laopaiboon M,Gülmezoglu AM,et al. Method of delivery and pregnancy outcomes in Asia: the WHO global survey on maternal and perinatal health 2007-08The LancetYear: 20103759713490499|
|4.||World Health OrganizationAppropriate technology for birthThe LancetYear: 198528452436437|
|5.||Belizán JM,Althabe F,Cafferata ML. Health consequences of the increasing caesarean section ratesEpidemiologyYear: 200718448548617568221|
|6.||Central Intelligence Agency, CIA The World Factbook 2010, https://www.cia.gov/library/publications/the-world-factbook/geos.ch.html.|
|7.||United NationsPopulation and Vital Statistics Report 2010, http://unstats.unorg/unsd/demographic/products/vitstats.|
|8.||Sufang G,Padmadas SS,Fengmin Z,Brown JJ,William Stones R. Delivery settings and caesarean section rates in ChinaBulletin of the World Health OrganizationYear: 2007851075576218038056|
|9.||Lei H,Wen SW,Walker M. Determinants of caesarean delivery among women hospitalized for childbirth in a remote population in ChinaJournal of Obstetrics and Gynaecology CanadaYear: 2003251193794314608444|
|10.||Lee LYK,Holroyd E,Ng CY. Exploring factors influencing Chinese women’s decision to have elective caesarean surgeryMidwiferyYear: 200117431432211749064|
|11.||Smith GCS,Cordeaux Y,White IR,et al. The effect of delaying childbirth on primary cesarean section ratesPLoS MedicineYear: 200857, article e14411231132|
|12.||Wagner M. Choosing caesarean sectionThe LancetYear: 2000356924216771680|
|13.||Stanton C,Ronsmans C,Bailey P,et al. Recommendations for routine reporting on indications for cesarean delivery in developing countriesBirthYear: 200835320421118844646|
|14.||Althabe F,Buekens P,Bergel E,et al. A cluster randomized controlled trial of a behavioral intervention to facilitate the development and implementation of clinical practice guidelines in Latin American maternity hospitals: the Guidelines Trial: Study protocol [ISRCTN82417627]BMC Women’s HealthYear: 20055, article 4|
|15.||Mitler LK,Rizzo JA,Horwitz SM. Physician gender and cesarean sectionsJournal of Clinical EpidemiologyYear: 200053101030103511027936|
|16.||Matshidze KP,Richter LM,Ellison GTH,Levin JB,McIntyre JA. Caesarean section rates in South Africa: evidence of bias among different ’population groups’Ethnicity and HealthYear: 199831-271799673465|
|17.||Mossialos E,Allin S,Karras K,Davaki K. An investigation of Caesarean sections in three Greek hospitals: the impact of financial incentives and convenienceEuropean Journal of Public HealthYear: 200515328829515923214|
|18.||Hueston WJ. Site-to-site variation in the factors affecting cesarean section ratesArchives of Family MedicineYear: 1995443463517711922|
|19.||De Almeida S,Bettiol H,Barbieri MA,Da Silva AAM,Ribeiro VS. Significant differences in cesarean section rates between a private and a public hospital in BrazilCadernos de Saude PublicaYear: 200824122909291819082282|
|20.||Sonnad SS,Moyer CA,Bernstein SJ. Comparing physician and administrator responses to cesarean section guidelines and actual practiceThe Joint Commission journal on quality improvementYear: 200026951552410983292|
|21.||Librero J,Peiró S,Márquez Calderón S. Inter-hospital variations in caesarean sections. A risk adjusted comparison in the Valencia public hospitalsJournal of Epidemiology and Community HealthYear: 200054863163610890876|
|22.||Guilherme Cecatti J,Besteti Pires HM,Faúndes A,Duarte Osis MJ. Factors associated with vaginal birth after previous cesarean section in Brazilian womenPan American Journal of Public HealthYear: 200518210711316156961|
|23.||Lo JC. Patients’ attitudes vs. physicians’ determination: implications for cesarean sectionsSocial Science and MedicineYear: 2003571919612753818|
|24.||Read AW,Prendiville WJ,Dawes VP,Stanley FJ. Cesarean section and operative vaginal delivery in low-risk primiparous women, Western AustraliaAmerican Journal of Public HealthYear: 199484137428279609|
|25.||Rasmussen HN,Scheier MF,Greenhouse JB. Optimism and physical health: a meta-analytic reviewAnnals of Behavioral MedicineYear: 200937323925619711142|
|26.||Park CL,Moore PJ,Turner RA,Adler NE. The roles of constructive thinking and optimism in psychological and behavioral adjustment during pregnancyJournal of Personality and Social PsychologyYear: 19977335845929294904|
|27.||Carver CS,Gaines JC. Optimism, pessimism, and postpartum depressionCognitive Therapy and ResearchYear: 1987114449462|
|28.||Fontaine KR,Jones LC. Self-esteem, optimism, and postpartum depressionJournal of Clinical PsychologyYear: 199753159639120033|
|29.||Grote NK,Bledsoe SE. Predicting postpartum depressive symptoms in new mothers: the role of optimism and stress frequency during pregnancyHealth and Social WorkYear: 200732210711817571644|
|30.||Rini CK,Dunkel-Schetter C,Wadhwa PD,Sandman CA. Psychological adaptation and birth outcomes: the role of personal resources, stress, and sociocultural context in pregnancyHealth PsychologyYear: 199918433334510431934|
|31.||Lobel M,DeVincent CJ,Kaminer A,Meyer BA. The impact of prenatal maternal stress and optimistic disposition on birth outcomes in medically high-risk womenHealth PsychologyYear: 200019654455311129357|
|32.||Norem JK,Cantor N. Defensive pessimism: harnessing anxiety as motivationJournal of Personality and Social PsychologyYear: 1986516120812173806357|
|33.||Norem J,Cantor N. Chang ECDefensive pessimism, optimism, and pessimismOptimism and Pessimism: Implications for Theory, Research, and PracticeWashington, DC, USAAmerican Psychological Association77100|
|34.||Chang EC,Sanna LJ. Optimism, accumulated life stress, and psychological and physical adjustment: is it always adaptive to expect the best?Journal of Social and Clinical PsychologyYear: 200322197115|
|35.||Moyer CA,Ekpo G,Calhoun CL,et al. Quality of life, optimism/pessimism, and knowledge and attitudes toward HIV Screening among pregnant women in GhanaWomen’s Health IssuesYear: 2008184301309|
|36.||Scheier MF,Carver CS. Optimism, coping, and health: assessment and implications of generalized outcome expectanciesHealth PsychologyYear: 1985432192474029106|
|37.||Scheier MF,Carver CS,Bridges MW. Distinguishing optimism from neuroticism (and trait anxiety, self-mastery, and self-esteem): a re-evaluation of the Life Orientation TestJournal of Personality and Social PsychologyYear: 1994676106310787815302|
|38.||Roscow Terrill D,Friedman DG,Gottschalk LA,Haaga DAF. Construct validity of the Life Orientation TestJournal of Personality AssessmentYear: 200279355056312511020|
|39.||Ji LIJ,Zhang Z,Usborne E,Guan Y. Optimism across cultures: in response to the severe acute respiratory syndrome outbreakAsian Journal of Social PsychologyYear: 2004712534|
|40.||Lai JC. Differential predictive power of the positively versus the negatively worded items of the Life Orientation TestPsychological ReportsYear: 1994753150715157886172|
|41.||Lai JC. The moderating effect of optimism on the relation between hassles and somatic complaintsPsychological ReportsYear: 19957638838947568606|
|42.||Lai JCL. Relative predictive power of the optimism versus the pessimism index of a Chinese version of the Life Orientation TestPsychological RecordYear: 1997473399410|
|43.||Lai JCL,Cheung H,Lee WM,Yu H. The utility of the revised life orientation test to measure optimism among Hong Kong ChineseInternational Journal of PsychologyYear: 19983314556|
|44.||Lai JCL,Hamid NP,Chow P. Gender difference in hassles and symptom reporting among Hong Kong adolescentsJournal of Social Behavior and PersonalityYear: 1996111149164|
|45.||Lai JCL,Wan W. Dispositional optimism and coping with academic examinationsPerceptual and Motor SkillsYear: 199685123278873169|
|46.||Lai JCL,Yue X. Measuring optimism in Hong Kong and mainland Chinese with the revised Life Orientation TestPersonality and Individual DifferencesYear: 2000284781796|
|47.||Friedman LC,Nelson DV,Baer PE,Lane M,Smith FE,Dworkin RJ. The relationship of dispositional optimism, daily life stress, and domestic environment to coping methods used by cancer patientsJournal of Behavioral MedicineYear: 19921521271411583677|
|48.||Segerstrom SC. Optimism and immunity: do positive thoughts always lead to positive effects?Brain, Behavior, and ImmunityYear: 2005193195200|
|49.||Segerstrom SC,Taylor SE,Kemeny ME,Fahey JL. Optimism is associated with mood, coping, and immune change in response to stressJournal of Personality and Social PsychologyYear: 1998746164616559654763|
|50.||Wrosch C,Scheier MF. Personality and quality of life: the importance of optimism and goal adjustmentQuality of Life ResearchYear: 200312supplement 1597212803312|
|51.||Saisto T,Halmesmäki E. Fear of childbirth: a neglected dilemmaActa Obstetricia et Gynecologica ScandinavicaYear: 200382320120812694113|
|52.||Mattis JS,Fontenot DL,Hatcher-Kay CA,Grayman NA,Beale RL. Religiosity, optimism, and pessimism among African AmericansJournal of Black PsychologyYear: 2004302187207|
|53.||Chang EC,Sanna LJ. Optimism, pessimism, and positive and negative affectivity in middle-aged adults: a test of a cognitive-affective model of psychological adjustmentPsychology and AgingYear: 200116352453111554528|
|54.||Schutte JW,Valerio JK,Carrillo V. Optimism and socioeconomic status: a cross-cultural studySocial Behavior and PersonalityYear: 1996241918|
|55.||Marshall GN,Wortman CB,Kusulas JW,Hervig LK,Vickers RR. Distinguishing optimism from pessimism: relations to fundamental dimensions of mood and personalityJournal of Personality and Social PsychologyYear: 199262610671074|
|56.||Kivimäki M,Elovainio M,Singh-Manoux A,Vahtera J,Helenius H,Pentti J. Optimism and pessimism as predictors of change in health after death or onset of severe illness in familyHealth PsychologyYear: 200524441342116045377|
|57.||Ellis M. Optimism may have life-extending benefits. Health News February 2010, http://www.ubuntu.com.|
|58.||Gifford DS,Morton SC,Fiske M,Keesey J,Keeler E,Kahn KL. Lack of progress in labor as a reason for cesareanObstetrics and GynecologyYear: 200095458959510725495|
|59.||Lee YT,Seligman MEP. Are Americans more optimistic than the Chinese?Personality and Social Psychology BulletinYear: 19972313240|
Previous Document: The active management of impending cephalopelvic disproportion in nulliparous women at term: a case ...
Next Document: Antenatal steroid therapy for fetal lung maturation and the subsequent risk of childhood asthma: a l...