Differences between the Distributions of Usual and Short-term Nutrient Intake in a Japanese Population
集団におけるエネルギー及び各栄養素の1日間及び2日間平均値(短期間)と習慣的な摂取量の分布の違い

Yumi Nakagawa, Midori Ishikawa, Tetsuji Yokoyama
2015 The Japanese Journal of Nutrition and Dietetics  
Objective: To reveal the problems in evaluating energy and nutrient intake using short-term (1-or 2-day) dietary survey data. Methods: We examined data from semi-weighed dietary records taken over 2 nonconsecutive days from 692 subjects (303 men, 389 women) aged ≥ 18 years who participated in the 2011 Kumamoto Prefecture Health and Nutrition Survey. The usual intake distributions of selected 13 nutrients were estimated using the Best-Power method with the power exponent and ratio of intra-and
more » ... ter-individual variances. Differences between the distributions of usual and short-term intake were compared using the shape, skewness, standard deviations, and the proportion of participants consuming less than the reference values. Results: The skewness of the 1-day intake distribution was larger than that of usual intake for 10 and 12 nutrients in men and women, respectively. The standard deviation for the short-term intake was larger than that for the usual intake for all nutrients (rato: 1.16~7.75). The differences in the proportion of participants consuming less than the reference values between short-term and usual intake were related to the ratio of intra-and inter-individual variances. The borders of the overestimation and underestimation were at the 50th percentile in the approximately normal distribution and the 70th percentile in the positively skewed distribution. Conclusions: These results demonstrated that the proportion of participants consuming less than the reference values based on the short-term dietary survey was overestimated or underestimated in relation to the distribution shape and the size of ratio of intra-and inter-individual variances. Jpn. J. Nutr. Diet., 73 (4) 119~132 (2015)
doi:10.5264/eiyogakuzashi.73.119 fatcat:zopqpvzk25f6fnpokdqup6jcs4