Statistics linear mixed model analysis; effect of the intervention and measurement on serum 25(OH)D measured in Week 4 and Week 8.

Statistics linear mixed model analysis; effect of the intervention and measurement on serum 25(OH)D measured in Week 4 and Week 8.线性混合模型统计学分析；干预措施与测量时点对第4周和第8周测得的血清25(OH)D（serum 25(OH)D）的影响。