Cost-Efficient Design of a Diet Validation Study

Stram, Daniel O.; Longnecker, Matthew P.; Shames, L S.; Kolonel, Laurence N.; Wilkens, Lynne R.; Pike, Malcolm C.; Henderson, Brian E.

doi:10.1093/oxfordjournals.aje.a117641

Cited by 63 publications

(46 citation statements)

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“…However, several studies enhanced the possibility of using only a small number of replicate measures for the reference method combined with a statistical adjustment to remove the effects of within-person variation. The greatest statistical efficiency is obtained with only two, and at the most five, replicates per subjects (Rosner and Willett, 1988;Stram et al, 1995;Carroll et al, 1997). In that context, to validate our FFQ against four 24-h recalls appeared as adequate.…”

Section: Validitymentioning

confidence: 79%

Reproducibility and relative validity of a food-frequency questionnaire among French adults and adolescents

et al. 2007

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Objective: Our aim was to evaluate the reproducibility of a food-frequency questionnaire (FFQ) developed in a French population, and its validity against four 24-h dietary recalls (24-HRs). Methods: A total of 57 adults (aged 18-63), 17 adolescents (aged 14-18) and 20 children (aged 10-14) completed four 24-HRs (one per season) and two FFQs over a 1-year interval. Reproducibility of the FFQ was estimated by intraclass correlation coefficients (ICCs). The validity of FFQ was assessed by comparison with the four 24-HRs. Results: For most nutrients, the first FFQ measurements gave higher mean values than the second FFQ. The ICCs for nutrients ranged from 0.39 for total protein to 0.83 for alcohol. The ICCs were higher for food items consumed daily such as milk (0.80) or sugars and confectionery (0.65), and lower for rarely eaten food such as inner organs (0.11). Nutrient intakes as assessed by FFQs were higher than those from the 24-HRs, except for alcohol. The de-attenuated Pearson's correlation coefficient for nutrients varied from 0.25 (dietary fiber) to 0.90 (alcohol), but the adjustment for energy did not improve these coefficients. When nutrient intakes were categorized into quintiles, FFQ and 24-HRs produced agreement rates (same or adjacent quintile) between 55% (for PUFA) and 95% (for alcohol), while misclassification to an extreme quintile was rare (o5%). Conclusion: The FFQ developed for the FLVS II Study can be used to classify adults or adolescents according to their nutrients and food intakes over a 1-year period.

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Section: Validitymentioning

confidence: 79%

Reproducibility and relative validity of a food-frequency questionnaire among French adults and adolescents

et al. 2007

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“…This enabled us to determine where further modifications to the questionnaire were needed (including identification of any omitted important foods) and provided useful data for designing an appropriate calibration study for the final study instrument. These data are discussed in a methodological paper on calibration study design (10).…”

Section: Questionnaire Developmentmentioning

confidence: 99%

“…Day of the week was randomly selected for the second and third recalls to ensure an adequate representation across days of the week. These data will be used to calibrate the dietary information from the questionnaires so that estimates of risk associated with intake can be made with less misclassification error (10,18). An accompanying paper describing the design and findings of the calibration study appears in this issue of the Journal (19).…”

Section: Calibration Studymentioning

confidence: 99%

A Multiethnic Cohort in Hawaii and Los Angeles: Baseline Characteristics

Kolonel

Henderson

Hankin

et al. 2000

American Journal of Epidemiology

880

1,002

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The authors describe the design and implementation of a large multiethnic cohort established to study diet and cancer in the United States. They detail the source of the subjects, sample size, questionnaire development, pilot work, and approaches to future analyses. The cohort consists of 215,251 adult men and women (age 45-75 years at baseline) living in Hawaii and in California (primarily Los Angeles County) with the following ethnic distribution: African-American (16.3%), Latino (22.0%), Japanese-American (26.4%), Native Hawaiian (6.5%), White (22.9%), and other ancestry (5.8%). From 1993 to 1996, participants entered the cohort by completing a 26-page, self-administered mail questionnaire that elicited a quantitative food frequency history, along with demographic and other information. Response rates ranged from 20% in Latinos to 49% in Japanese-Americans. As expected, both within and among ethnic groups, the questionnaire data show substantial variations in dietary intakes (nutrients as well as foods) and in the distributions of non-dietary risk factors (including smoking, alcohol consumption, obesity, and physical activity). When compared with corresponding ethnic-specific cancer incidence rates, the findings provide tentative support for several current dietary hypotheses. As sufficient numbers of cancer cases are identified through surveillance of the cohort, dietary and other hypotheses will be tested in prospective analyses. Keywords alcohol drinking; cohort studies; diet; ethnic groups; obesity; physical fitness; prospective studies; smoking Ethnic minorities in the United States have not been well represented in epidemiologic research on diet and cancer, especially in prospective cohort studies. Thus, little is known about the relation of dietary factors to cancer risk in these groups. Furthermore, while diet and other external factors are the predominant determinants of cancer risk in all these groups (1), the extent to which environmental exposures explain interethnic differences in incidence Reprint requests to Dr. Laurence Kolonel, Cancer Research Center of Hawaii, 1236 Lauhala Street, Honolulu, HI 96813. HHS Public Access Author Manuscript Author Manuscript Author ManuscriptAuthor Manuscript is not known. By including a variety of ethnic groups within a single study, and by using a common data collection methodology in all groups, interethnic comparisons of exposuredisease relations can readily be made.Hawaii has long presented special opportunities for epidemiologic research because of its diverse ethnic/cultural environment. Over the past two decades, the Los Angeles basin has also attracted large ethnic populations, including a variety of groups from Asia, and Latino migrants from Mexico and Central and South America. Together, these two areas now provide an unmatched resource for epidemiologic initiatives.Recognizing the need for dietary studies of ethnic minorities in the United States, the unique opportunities offered by Hawaii and southern California for conducting cross-ethnic a...

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“…The records should be kept for a sufficient number of days to represent the average intake (Cade et al, 2002). Cost and respondent burden has to be taken into consideration and Stram et al (1995) have found that in most settings the optimal study design will rarely require more than 4-or 5-day diet records per subject. In the present study, the method's estimated mean intake was validated with 1-day weighed record and the method's estimation of usual intake was validated with 7-day food record.…”

Section: Introductionmentioning

confidence: 99%

Validity of a questionnaire to assess fruit and vegetable intake in adults

et al. 2005

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Objective: To validate a method for assessing fruit and vegetable intake among adults in a population of low intake. The method assesses mean intake and ranks individuals by their usual intake. Design: A precoded fruit and vegetable Questionnaire included a 24-h recall and a food frequency. The participants filled in the Questionnaire, a week later they started a 7-day food record, 1-day weighed record and 6 days using household measures. Subjects: Following advertisements 40 participants were recruited, 36 returned food records(mean age ¼ 37 years). Results: No difference was observed between the average intake yielded by the 24-h recall and that from the 1-day weighed food record of fruits or vegetables. Correlation coefficients between results from the food frequency questionnaire and the 7-day food records were 0.45 (P ¼ 0.007) for vegetables, 0.63 (Po0.001) for fruits and 0.73 (Po0.001) for fruits and vegetables combined. Cross-classification into quartiles showed that the proportion of participants in the same or the adjacent quartile of the intake distribution were 94% for fruit intake and 80% for vegetable intake. Registered intake of fruits and vegetables was higher the first 4 days of the record than the last 3 days (P ¼ 0.002). The 4-day food record correlated with the food frequency questionnaire in similar manner as the 7-day record. Conclusion: The present study indicates that the precoded 24-h recall may be valuable tool for measuring average intake of fruits and vegetables among adults in a population of low intake. Moreover, the food frequency questionnaire was valid for ranking individuals according to their usual intake. A 4-day food record might be sufficient when validating food frequency questionnaires for fruits and vegetables.

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Cost-Efficient Design of a Diet Validation Study

Cited by 63 publications

References 0 publications

Reproducibility and relative validity of a food-frequency questionnaire among French adults and adolescents

Reproducibility and relative validity of a food-frequency questionnaire among French adults and adolescents

A Multiethnic Cohort in Hawaii and Los Angeles: Baseline Characteristics

Validity of a questionnaire to assess fruit and vegetable intake in adults

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