Serum 25-hydroxyvitamin D concentrations by demographic and lifestyle characteristics among healthy controls.
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1For some characteristics, the numbers did not add up to the totals due to missing data. 2P-values were derived from Wilcoxon rank test for variables with two levels and Kruskal-Wallis test for variables with more than two levels. Abbreviation: IQR, interquartile range.
创建时间：
2011-02-28
