Reproducibility and validity of dietary patterns identified using factor analysis among Chinese populations. Issue 5 (13th July 2016)

• Record Type: Journal Article
• Authors: Hong, Xin; Ye, Qing; Wang, Zhiyong; Yang, Huafeng; Chen, Xupeng; Zhou, Hairong; Wang, Chenchen; Chu, Wenjie; Lai, Yichao; Sun, Liuyuan; Wang, Youfa; Xu, Fei
• Is Part Of: British journal of nutrition. Volume 116:Issue 5(2016)
• Page Start: 842
• Page End: 852
• Publication Date: 2016-07-13
• Subjects: Reliability, -- Validity, -- Dietary patterns, -- Factor analyses, -- China; Nutrition -- Periodicals; 572.4
• DOI: 10.1017/S000711451600249X
• Languages: English
• ISSNs: 0007-1145

Abstract

Abstract: In the present study, we evaluated the reproducibility and validity of dietary patterns among Chinese adult populations. A random subsample of 203 participants (aged 31–80 years) from a community-based nutrition and health survey was enrolled. An eighty-seven-item FFQ was administered twice (FFQ1 and FFQ2) 1 year apart; four 3 consecutive day, 24-h dietary recalls (24-HDR, as a reference method) were performed between the administrations of the two FFQ every 3 months. Dietary patterns from three separate dietary sources were derived using factor analysis based on twenty-eight predefined food groups. Comparisons between dietary pattern scores were made by using Pearson's or intraclass correlation coefficients (ICC), cross-classification analysis, weighted κ statistic and Bland–Altman plots; the four major dietary patterns identified from FFQ1, FFQ2 and 24-HDR were similar. Regarding reproducibility, ICC for z -scores between FFQ1 and FFQ2 were all >0·6 for dietary patterns. The 'animal and plant protein' pattern had the highest ICC of 0·870. For validity, the adjusted Pearson's correlation coefficients for dietary pattern z -scores between two FFQ and the mean of four 3 consecutive day 24-HDR ranged from 0·387 for the 'Chinese traditional' pattern to 0·838 for the 'animal and plant protein' pattern. More than 75 % of the participants were classified into the same or adjacent quartile, and <5 % were misclassified into opposite quartiles. The weighted κ ranged from 0·259 to 0·680. Bland–Altman plots indicated that no significant deviation was found between two dietary assessment methods. Our findings indicate a good reasonable reproducibility and a reasonable validity of dietary patterns derived by factor analysis in China.