General characteristics in men (whole sample and by age group), expressed as medians (first and third quartiles) or percentages, as appropriate.
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数据链接：
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资源简介：
25(OH)D: 25-hydroxy-vitamin D; ys: years; BMI: body mass index; COPD: chronic obstructive pulmonary disease; 6MWD: six-minute walking distance.
创建时间：
2014-04-10
