作者: Susan M. Krebs-Smith , Jerianne Heimendinger , Amy F. Subar , Blossom H. Patterson , Elizabeth Pivonka
DOI: 10.1016/S0022-3182(12)80346-3
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摘要: Abstract The purpose of this study was to determine how estimates fruit and vegetable intake, as determined from food frequency questionnaires, may be affected by the number foods included. Three different national surveys adults were used. Each employed a questionnaire, but each included questions related fruits vegetables. Compared across surveys, values for median intake individual vegetables generally similar. However, total summing all in respective very associated with asked: 1987 National Health Interview Survey 20 regarding vegetables, 23.8 times per week; baseline survey 5 A Day Better Program 33 questions, 34.6; 1982–1984 NHANES I Epidemiologic Follow-up 40 38.8. These findings suggest that frequencies not valid way assess intakes Summary and/or adjustment factors need increase precision estimates.