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validation of a food frequency questionnaire in the hiroshima/nagasaki life span study.we evaluated the performance of a 22-item food frequency questionnaire (ffq) administered in 1980-81 to 3,005 members of the adult health study cohort, part of the life span study. the questionnaire was compared with the records of a 24-hour dietary survey that was performed in 1984-85. from the dietary records, food and nutrient intakes were estimated. the association between the two measures of dietary intake was assessed using mantel-haenszel chi-square test and the spearman's rank correlatio ...200212395883
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