Compared with placebo , vitamin D significantly increased @-hydroxyvitamin D ( mean -LSB- @ % confidence interval -RSB- in vitamin D group @ -LSB- @ to @ -RSB- ng/mL at baseline and @ -LSB- @ to @ -RSB- ng/mL at @ weeks ; placebo @ -LSB- @ to @ -RSB- ng/mL at baseline and @ -LSB- @ to @ -RSB- ng/mL at @ weeks ) .