title: Reproducibility and validity of an extensive semiquantitative food frequency questionnaire among Greek school teachers.
abstract: We evaluated the reproducibility and validity of a 190-item semiquantitative food frequency questionnaire (FFQ) to be used in a large prospective study in the Athens area of Greece. Eighty persons, 42 men and 38 women, ages 25-67 years, completed a self-administered FFQ, followed by monthly 24-hour diet recalls and then a second FFQ 1 year after the first. Correlation coefficients measuring the reproducibility and validity of the FFQ indicate that the questionnaire is reproducible and provides a reasonably reliable measure of intake for many nutrients over a period of 1 year.
authors.affiliation: Department of Nutrition and Biochemistry, Athens School of Public Health, Greece.
authors.forename: C
authors.initials: C
authors.lastname: Gnardellis
authors.forename: A
authors.initials: A
authors.lastname: Trichopoulou
authors.forename: K
authors.initials: K
authors.lastname: Katsouyanni
authors.forename: E
authors.initials: E
authors.lastname: Polychronopoulos
authors.forename: E B
authors.initials: EB
authors.lastname: Rimm
authors.forename: D
authors.initials: D
authors.lastname: Trichopoulos
mesh_terms: D000328:Adult; D000368:Aged; D004034:Diet Surveys; D004435:Eating; D005260:Female; D006115:Greece; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D010865:Pilot Projects; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D013663:Teaching