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The purpose of this study was to develop a semi-quantitative food frequency questionnaire(SQ-FFQ) for subjects aged 50yr and over and to evaluate the validity of this SQ-FFQ. Dietary intake was assessed using SQ-FFQ that included 98 commonly consumed food items selected from the results of the Korean Health and Nutritional Survey, 1998. Subjects(n=2660) aged 50 yr and over were recruited from 7 metropolitan cities and 8 small cities. Each subject was interviewed using this SQ-FFQ developed in our laboratory and 24hr-recall method. Excluding incomplete data, Data from 1149 subjects were used in this validity study. The nutrient intakes assessed by this SQ-FFQ were validated by comparing with the results from 1 day 24-hour recalls. Pearson's correlation coefficients between two methods were 0.71, 0.64, 0.53 and 0.43 for energy, carbohydrate, protein and fat, respectively for all subjects. Spearman's correlation coefficients were higher than those of Pearson's correlation coefficients. Kappa values for energy, carbohydrate, protein, and fat were 0.79, 0.72, 0.70 and 0.64, respectively. The percentage for misclassification of the lowest quartile into the highest quartile or vice versa was 1.25 - 1.39% for all nutrients. Therefore, this SQ-FFQ seems to be useful in assessing the nutritional status of the middle-aged and elderly subjects in Korea. (Korean J Community Nutrition 7(2): 277~285, 2002)

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