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American Journal of Epidemiology Vol. 122, No. 1: 51-65
Copyright © 1985 by The Johns Hopkins University School of Hygiene and Public Health


research-article

REPRODUCIBILITY AND VALIDITY OF A SEMIQUANTITATIVE FOOD FREQUENCY QUESTIONNAIRE

WALTER C. WILLETT1,2,, LAURA SAMPSON1, MEIR J. STAMPFER1,2, BERNARD ROSNER1, CHRISTOPHER BAIN3, JELIA WITSCHI2, CHARLES H. HENNEKENS1 and FRANK E. SPEIZER1

1The Channing Laboratory, Department of Medicine, Harvard Medical School and Brigham and Women's Hospital Boston, MA
2Departments of Epidemiology and Nutrition, Harvard School of Public Health Boston, MA
3Department of Social and Preventive Medicine, University of Queensland Australia

Reprint requests to Dr. Walter C. Willett, Chan-ning Laboratory, 180 Longwood Avenue, Boston, MA 02115

The aim of this study was to evaluate the reproducibility and validity of a 61-item semiquantitative food frequency questionnaire used in a large prospective study among women. This form was administered twice to 173 participants at an interval of approximately one year (1980–1981), and four one-week diet records for each subject were collected during that period. Intraclass correlation coefficients for nutrient intakes estimated by the one-week diet records (range=0.41 for total vitamin A without supplements to 0.79 for vitamin B, with supplements) were similar to those computed from the questionnaire (range=0.49 for total vitamin A without supplements to 0.71 for sucrose), indicating that these methods were generally comparable with respect to reproducibilrty. With the exception of sucrose and total carbohydrate, nutrient intakes from the diet records tended to correlate more strongly with those computed from the questionnaire after adjustment for total caloric intake. Correlation coefficients between the mean calorie-adjusted intakes from the four one-week diet records and those from the questionnaire completed after the diet records ranged from 0.36 for vitamin A without supplements to 0.75 for vitamin C with supplements. Overall, 48% of subjects in the lowest quintile of calorie-adjusted intake computed from the diet records were also in the lowest questionnaire quintile, and 74% were in the lowest one of two questionnaire quintiles. Similarly, 49% of those in the highest diet record quintile were also in the highest questionnaire quintile, and 77% were in the highest one or two questionnaire quintiles. These data indicate that a simple serf-administered dietary questionnaire can provide useful information about individual nutrient intakes over a one-year period.

diet; epidemiologic methods; food; nutrition; nutrition surveys; questionnaires


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