Reproducibility and validity of an extensive semiquantitative food frequency questionnaire among Greek school teachers.
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.
Gnardellis
C
C
Department of Nutrition and Biochemistry, Athens School of Public Health, Greece.
Trichopoulou
A
A
Katsouyanni
K
K
Polychronopoulos
E
E
Rimm
E B
EB
Trichopoulos
D
D
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