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 trial conducted between 1992 and 1994 to test the feasibility of a low-fat dietary intervention that targeted low-income, black, and Hispanic women.
Of 1,015 participants eligible for these analyses, 28.1% were black, 16.2% were Hispanic, and 12.3% had not completed high school.
The analyses focused on percentage of energy obtained from fat, and used 4-day food records as the criterion instrument.
Validity at baseline, defined as the correlation between FFQs and food records, was lower among blacks than among whites (0.26 vs. 0.49 ; p<0.001), did not differ between Hispanics and whites, and was lower among women with fewer years of education (0.19,0.35,0.49, and 0.42 for<12,12,13-15, and = 16 years of education, respectively ; for trend, p<0.05).
Six months after randomization, validity increased in most race/ethnicity and education subgroups, and differences across groups became small and statistically nonsignificant.
Validity increased significantly among participants receiving the dietary intervention, while increases among control women were somewhat smaller. (...)
Mots-clés Pascal : Epidémiologie, Questionnaire, Validation test, Fidélité test, Biais méthodologique, Méthodologie, Race, Ethnie, Niveau étude, Minorité, Homme, Femelle, Nutrition, Fréquence alimentaire
Mots-clés Pascal anglais : Epidemiology, Questionnaire, Test validation, Test reliability, Methodological bias, Methodology, Race, Ethnic group, Education level, Minority, Human, Female, Nutrition
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0007799
Code Inist : 002B30A01A1. Création : 17/04/1998.