REPRODUCIBILITY AND VALIDITY OF AN EXTENSIVE... : Epidemiology (original) (raw)

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REPRODUCIBILITY AND VALIDITY OF AN EXTENSIVE SEMIQUANTITATIVE FOOD FREQUENCY QUESTIONNAIRE AMONG GREEK SCHOOL TEACHERS

Gnardellis, Charalambosl; Trichopoulou, Antonia1; Katsouyanni, Klea2; Polychronopoulos, Evangelos1; Rimm, Eric B.3, 4; Trichopoulos, Dimitrios2, 3

1Department of Nutrition and Biochemistry, Athens School of Public Health, Athens

2Department of Hygiene and Epidemiology, University of Athens Medical School, Athens, Greece

3Departments of Epidemiology

4Nutrition, Harvard School of Public Health, Boston, MA.

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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.