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Results 651 - 700 of 935
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Kristal A R - - 1997
This report describes the associations of race/ethnicity and years of education with the validity, reliability, and bias of a self-administered food frequency questionnaire (FFQ) designed to be sensitive to low-fat, regional, and ethnic dietary patterns. Data were from the Women's Health Trial Feasibility Study in Minority Populations, a randomized clinical ...
Metcalf P - - 1997
The reproducibility and validity of a self-administered 142-item food-frequency questionnaire (FFQ) was assessed in a population comprising 124 European and 52 Polynesian (17 Maori and 35 Pacific Island) New Zealanders aged 40-65 years. Reproducibility correlation coefficients, determined by administration of the same questionnaire on two occasions 3 years apart, were ...
Baxter S D - - 1997
OBJECTIVE: To validate fourth-graders' self-reports of school lunch by comparing their reports to lunch observations, and to determine the impact on accuracy of gender, ethnicity, meal component, and time interval between eating and reporting. DESIGN: Students were randomly selected, observed eating lunch, and interviewed the same day, next day, or ...
Elmståhl S - - 1997
BACKGROUND: If several risk factors for disease are considered in a regression model and these factors are affected by measurement errors, the observed relative risk will be attenuated. In nutritional epidemiology, several nutrient variables show strong correlation, described as collinearity. The observed relative risk will then depend not only on ...
Schaffer D M - - 1997
PURPOSE: We evaluated the performance of a telephone-administered food frequency questionnaire in a study of 190 men and women, 30-79 years of age, who participated as controls in a study of colon cancer. METHODS: The telephone version of the questionnaire was modified from a longer food frequency questionnaire originally administered ...
Calvert C - - 1997
OBJECTIVE: To explore the potential mis-reporting of specific food groups from food frequency questionnaire (FFQ) data and to examine the effect of using a weighting factor on estimated nutrient intake and ranking of subjects within the cohort according to nutrient intake. DESIGN AND SUBJECTS: A weighting factor was calculated for ...
Hashimoto S - - 1997
Misclassification and temporal changes of food consumption frequencies were estimated under the statistical models with some assumptions, and their effects on risk ratios were evaluated. Food frequencies of 27 items in 214 subjects were doubly measured by a questionnaire with 2 weeks interval, and those in 326 subjects were measured ...
Vandenlangenberg G M - - 1997
OBJECTIVE: To determine the extent to which incorporating fat-modified foods into a food frequency questionnaire influences the agreement of energy and nutrient estimates with estimates obtained from food records. DESIGN: Subjects completed four 2-day food records at 3-month intervals. At the end of the recording period, a food frequency questionnaire ...
Riboli E - - 1997
OBJECTIVE: The aim of the study was to investigate the reproducibility of a food frequency questionnaire (FFQ) used in a cohort of 14,290 women enrolled in the NYU Women's Health Study. DESIGN: A subset of 474 cohort subjects who completed the dietary questionnaire at baseline (FFQ-1) were approached again on ...
Fujiwara N - - 1997
We evaluated the reproducibility of data on intake frequency of 33 food items, beverage intake frequency of 3 items, drinking and smoking habits, and past history of 10 diseases obtained from a self-administered questionnaire. The survey subjects consisted of 263 aged 39 to 79 years individuals in the general population. ...
Gray-Donald K - - 1997
OBJECTIVE: To validate an adaptation of a short questionnaire measuring behaviour related to selecting low fat diets. The questionnaire was adapted for telephone use in a low income, low education population. DESIGN: The factorial structure of the 38 item adaptation was studied in a population based random sample of 1432 ...
D'Avanzo B - - 1997
In order to assess the comparability and reproducibility of information from a questionnaire used in a case-control study on digestive tract cancers conducted in Italy, a total of 400 subjects were randomly selected from a large sample of hospital controls and contacted at home to repeat the interview. Of these, ...
Johansson L L National Nutrition Council, Institute for Nutrition Research, University of Oslo, - - 1997
To evaluate the use of a self-administered quantitative food frequency questionnaire (QFFQ) in a national dietary survey concerning (a) response rates with different distribution methods and reward; (b) degree of underreporting of energy intake; (c) reproducibility of the QFFQ; and (d) seasonal variation on reported intake. A pilot study was ...
Ritenbaugh C - - 1997
Cancer prevention clinical trials use food frequency questionnaires (FFQs) to assist in eligibility screening. FFQ reliability and validity studies are available, but these studies do not evaluate FFQs as screening tools. The Wheat Bran Fiber Trial of the University of Arizona used a FFQ as an eligibility screen with the ...
Bonifacj C - - 1997
OBJECTIVE: The main objective of the study was to develop appropriate dietary assessment instruments for the French Mediterranean region and to validate the measurements they provide. SUBJECTS AND METHODS: Three different assessment methods were submitted to a sample of 150 male and female volunteers. 98 completed the protocol, which consisted ...
Kumanyika S K - - 1997
Food-frequency questionnaires are usually administered as a list of foods to be checked off by the respondent or interviewer. Techniques in which participants sort into categories cards on which names or pictures of foods are printed can also be used to assess food intake. Food-frequency scores were obtained from a ...
Chiva M - - 1997
The present paper presents a certain number of cultural elements which interact in the determination of the frequency of food intake. Approaches from various perspectives (historical, ethnological, anthropological, sociological) draw attention to two major aspects relating to the periodicity of food intake: the extreme cultural diversity and the continual modifications ...
Bingham S A - - 1997
Biomarkers of nutrition intake were used to validate the dietary assessments proposed for use in the European prospective study of diet and cancer (EPIC). In the UK validation studies, the accuracy of several tested methods was assessed with weighed food records and biomarkers, 24 h urine nitrogen, potassium and plasma ...
Marshall J R - - 1997
Nutrient indexes derived from food-frequency questionnaires have generally been regarded as acceptably valid for epidemiologic purposes. Evaluations of these indexes, however, have considered only their convergent validity. We suggest that discriminant validity, or the ability to distinguish among exposures to different nutrients, is also important. Using baseline data from a ...
Bingham S A - - 1997
The validity of dietary assessment methods in a group of women aged 50-65 y was evaluated with use of biochemical markers. Estimates of nitrogen, potassium, and carotene intakes from weighed-food and estimated records yielded higher correlations with urinary nitrogen, urinary potassium, and serum concentrations of carotenoids than did estimates from ...
Carroll R J - - 1997
We investigated some design aspects of calibration studies. The specific situation addressed was one in which a large group is evaluated with a food-frequency questionnaire and a smaller calibration study is conducted through use of repeated food records or recalls, with the subjects in the calibration study constituting a random ...
Thompson F E - - 1997
A register of dietary assessment calibration-validation studies was created to improve communication between investigators, avoid duplication of effort, and identify gaps in knowledge. Calibration-validation studies were defined as investigations in which the participants completed at least two different dietary measurements. A questionnaire soliciting descriptive information about such studies was widely ...
Dwyer J T - - 1997
We studied the validity and consistency of memory of foods consumed decades earlier in a longitudinal population of 91 persons. The memory of middle-aged persons for food intake years earlier did not decline invariably over time, although median correlations between actual and recalled consumption decreased. Time-related memory loss varied greatly ...
Kaaks R J - - 1997
Studies of the accuracy of questionnaire measurements of habitual dietary intakes of individuals are generally based on a comparison with replicate weighed-food consumption records or 24-h recalls used as reference measurements. The correlation between the questionnaire measurements (Q) and the subjects' true long-term intake (T) of foods or nutrients (rho ...
Coates R J - - 1997
To assess the performance of food-frequency questionnaires in minority populations, we reviewed published studies of such questionnaires with respect to reports of reliability, bias in mean intake estimates, validity, and factors that might affect these characteristics, including the method by which a questionnaire was developed. Because of the small number ...
de Vries J H - - 1997
Quercetin and related flavonoids are anticarcinogenic in rats, but little is known about human intakes. The intake of five major flavonols and flavones was calculated using 1-day dietary records of 17 volunteers from 14 countries, and using both 3-day records and a food frequency questionnaire of eight Dutch adults. Total ...
McCarty C A - - 1997
OBJECTIVE: Epidemiologic evidence of a role for antioxidants in the prevention of chronic disease has been inconclusive, in part due to the difficulty of measuring past diets of free-living populations. The purpose of the current study was to examine the reliability of a 19-item, self-administered, semiquantitative, food frequency questionnaire to ...
Dop, Marie-Claude
The aim of the study was to validate the 24-hour recall as a tool for nutrition surveys in Algeria. The reference was the weighing method. The study took place in a rural district of North-Eastern Algeria. The subjects were 50 women of child-bearing age, chosen at random in the district ...
Tsubono Y - - 1997
There has been considerable controversy about the utility of asking separate questions on portion sizes in addition to items on consumption frequencies in food frequency questionnaires. One argument against this type of inquiry is that, for most foods, within-person variation of portion size is greater than between-person variation, making it ...
Boeing H - - 1997
BACKGROUND: For the European Prospective Investigation into Cancer and Nutrition (EPIC) study Germany, a self-administered food frequency questionnaire (FFQ) was developed and tested for its relative validity and reproducibility in 1991/1992. Study participants were 92 potential cohort members. This paper reports results regarding retinol, carotenoids, tocopherols and ascorbic acid. METHODS: ...
Bohlscheid-Thomas S - - 1997
BACKGROUND: For use in the German part of the European Prospective Investigation into Cancer and Nutrition (EPIC) a self-administered, optically readable food frequency questionnaire (FFQ) was developed to assess individuals' usual food and nutrient intake over the past year. The food list comprised 158 food items for which the typical ...
Bingham S A - - 1997
BACKGROUND: In the UK EPIC validation studies, the accuracy of several methods was assessed by comparison with to-day weighed records and the biomarkers, 24-hour urine nitrogen (N) and potassium (K), plasma carotenoids and plasma vitamin C. METHODS: Comparisons between methods were made on 156 women, studied over 1 year at ...
Bohlscheid-Thomas S - - 1997
BACKGROUND: For the German part of the European Prospective Investigation into Cancer and Nutrition (EPIC), a self-administered, optically-readable food frequency questionnaire (FFQ), including 158 food items and 87 coloured portion size photographs, was developed to assess the usual food and nutrient intake of individuals during the past year. In 1991/1992, ...
Pisani P - - 1997
A pilot questionnaire was developed for the EPIC centres of northern Italy, and validated in the feasibility part of the cohort project. The questionnaire was self-administered and of the food frequency type with portion size estimated by means of pictures. It was structured by courses within a meal characteristic of ...
Tsubono Y - - 1997
To explore the causes of the threefold variation in mortality rate from gastric cancer in Japan, we studied the geographic correlations between food consumption and age-adjusted mortality rates in five regions, which covered the areas with the highest and lowest mortality rates in the country. Six hundred thirty-four men and ...
Maffei C - - 1997
Interrater reliability and internal consistency of the SCID-II 2.0 was assessed in a sample of 231 consecutively admitted in- and outpatients using a pairwise interview design, with randomized rater pairing and blind interview assessment. Interrater reliability coefficients ranged from .48 to .98 for categorical diagnosis (Cohen kappa), and from .90 ...
Swan P D - - 1997
Patterns of nutrition and exercise throughout the life span may account for differences in health problems of aging. The purpose of this study was to develop and validate a simple life span history questionnaire of dairy food intake and to assess recalled levels of leisure time physical activity over the ...
Ocké M C - - 1997
BACKGROUND: A self-administered food frequency questionnaire was developed for the Dutch cohort of the European Prospective Investigation into Cancer and Nutrition (EPIC). Habitual consumption of 178 food items can be calculated from the questionnaire data. METHODS: Reproducibility and relative validity for food group intake were investigated in a population of ...
- - 1997
BACKGROUND: A pilot study was carried out to evaluate the relative validity and reproducibility of a dietary history questionnaire (DH) designed to be used in Spain as part of a prospective European research project on diet and cancer. METHODS: A total of 91 volunteers (46 men and 45 women) aged ...
van Liere M J - - 1997
BACKGROUND: A self-administered dietary history questionnaire, especially developed for use in a large French prospective cohort study, was tested for accuracy of food intake measurement by comparing it to the average of 9-12 24-hour recalls. This questionnaire was structured according to the French meal pattern. An important feature of the ...
Moon C S - - 1996
In order to make quantitative comparison between food composition table-based estimates and instrumental measures by inductively coupled plasma atomic emission spectrometry (ICP-AES), total food duplicates were collected from 232 adult women in 10 study regions in 9 Prefectures in Japan. Daily dietary intake of 5 elements, sodium (Na), potassium (K), ...
VandenLangenberg G M - - 1996
OBJECTIVE: This study compared distributions of carotenoid intake and diet-serum correlations using two sources of carotenoid data: the US Department of Agriculture-National Cancer Institute (USDA-NCI) carotenoid food composition database and values accompanying the Block-NCI Health Habits and History Questionnaire (HHHQ). DESIGN AND SUBJECTS: A 100-item food frequency questionnaire was used ...
Ritenbaugh C - - 1996
Carotenoid consumption is of great interest in disease prevention studies. Until recently, carotenoid food composition data have not been available from a single laboratory source with high validity/reliability characteristics. With the availability of a new carotenoid food composition data base, we examined the impact of the new data base on ...
Harty J - - 1996
The statistical relationship between solute clearance (expressed as Kt/V) and dietary protein intake (DPI; estimated from the normalized protein catabolic rate [NPCR]) has led to the assumption that dialysis dose is one of the most important determinants of DPI in continuous ambulatory peritoneal dialysis patients. However, there is increasing concern ...
Woodward D R - - 1996
This paper reports a study of factors associated with the consumption of 22 diverse foods among 2082 students aged 12-15 years in Tasmania, Australia. Students provided data by completing a printed questionnaire. Multiple linear regression was used to assess how well self-reported usual (past) frequency of consumption of a food ...
Osler M - - 1996
BACKGROUND: In studies of health behaviour exploring factors associated with differences and changes in eating patterns of populations, diet is often measured with short food frequency questionnaires (FFQ). This study examines the validity of a short FFQ by comparing frequencies of food intake from the FFQ to information on food ...
Date C - - 1996
The three-consecutive-day weighing method, in which foods as raw materials are weighed separately before they are cooked, is the most popular dietary assessment method among Japanese dietitians, because this dietary survey method has been adopted in the national nutrition survey for half a century. Under such circumstances, there have been ...
Mares-Perlman J A - - 1996
OBJECTIVE: To quantify relationships between dietary intake of zinc and antioxidant nutrients and early and late age-related maculopathy (ARM). DESIGN: A retrospective longitudinal cohort design using data pertaining to diets in the past (1978-1980), which were assessed retrospectively using a food frequency questionnaire. SETTING: Beaver Dam, Wis. PATIENTS: A 50% ...
Sharma S - - 1996
OBJECTIVES: To develop the methods for assessment of food and nutrient intake using standardized food frequency questionnaires (FFQ) in three African origin populations from Cameroon, Jamaica and Caribbean migrants to the United Kingdom. DESIGN: Cross-sectional assessment of diet from a representative sample in each site, using either a 2-day food ...
Smit E - - 1996
Dietary intake was assessed in a subsample of a cohort of inner-city injecting drug users (IDUs). In this population of predominantly African-American IDUs, including both HIV -1-infected and noninfected men and women, a food frequency questionnaire (FFQ) and a 24-h recall were administered. One hundred seven volunteers participated. Although total ...
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