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Percentage of vitamin D–insufficient participants by treatment and week. The prevalence of vitamin D insufficiency in the vitamin D group (n = 22; black bars) was reduced by weeks 12 and 52. The vitamin D–insufficiency prevalence was higher in the placebo group (n = 24; white bars) than in the vitamin D group at weeks 12 (P < 0.001; chi-square test) and 52 (P = 0.08, chi-square test). 25(OH)D, 25-hydroxyvitamin D.
