The authors studied temporal change in the reproducibility of a self-administered food frequency questionnaire.
During 1988-1994,492 residents of a rural Japanese town completed five questionnaires including 27 food items, with intervals ranging from 2 weeks through 5.5 years.
The reproducibility decreased steadily over time for pairs of the questionnaires administered in the same season (median Spearman's r at 2 weeks and 5 years=0.62 and 0.28, respectively).
The reduction was less marked for those surveyed in different seasons (median r at 5 months and 5.5 years=0.35 and 0.28, respectively).
The short-term, different season correlation at 5 months was lower than the short-term, same season correlation at 1 year.
For individual food items, a lower initial reproducibility, infrequent consumption, and a larger difference in seasonal intake were associated with a greater reduction in reproducibility over time.
The results indicate that reproducibility studies should deliberately choose the intervals and the seasons for surveys.
Mots-clés Pascal : Epidémiologie, Méthode étude, Alimentation, Nutrition, Enquête, Questionnaire, Autoévaluation, Homme, Japon, Asie, Reproductibilité, Variation saisonnière, Consommation alimentaire, Comportement alimentaire, Fréquence alimentaire
Mots-clés Pascal anglais : Epidemiology, Investigation method, Feeding, Nutrition, Inquiry, Questionnaire, Self evaluation, Human, Japan, Asia, Reproducibility, Seasonal variation, Food intake, Feeding behavior
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0021777
Code Inist : 002B29B. Création : 01/03/1996.