質問紙を用いた食生活調査による食塩摂取状況の推定方法

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In order to study how to estimate salt intake from the results of a food frequency questionnaire, NaCl and creatinine contents in 24-hour urine were measured, and eating habits and the intake frequencies of various foods were investigated using a specially structured questionnaire on 183 women aged 20 to 74 years who lived in a rural district in Kyoto Prefecture.1. Intake frequencies of various foods and the eating habits did not differ greatly among age groups, but the intake frequency of pickles and salted and dried fish were higher among older persons, while old women prefered a less-salty taste compared to younger women.2. Using the NaCl/Cr ratio in urine as an index of the salt intake of individuals, subjects were divided into a low-intake (A) group, a middle-intake (B) group and a high-intake (C) group. Using the index of salt intake for the three groups as the objective variable and 21 items in the food frequency questionnaire and age group as explanatory variables, the data were submitted to a statistical analysis called quantification theory II, but the rate of correct classification was low. When the same analysis was applied to the subjects in groups A and C only, the rate of correct classification went up to 83%.3. The salt intake score calculated from the category weight obtained from the analysis of groups A and C only, or from the simplification of the category weight, correlated well with the NaCl/Cr ratio as compared with the traditional salt intake score. The salt intake score obtained in this study seems to be useful for the estimation of the salt intake of individuals.4. The number of items in the food frequency questionnaire which were used to calculate the new salt intake score was 15. Besides five items relating directly to salt intake which were already used to calculate the traditional salt intake score, 10 items concerned with the food intake pattern were included for the calculation of the new salt intake score. This result seems to suggest that the food intake pattern is also an important factor for determining the salt intake.
日本衛生学会の論文

質問紙を用いた食生活調査による食塩摂取状況の推定方法

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