Twelve weeks after vitamin D replacement , there was a significant increase in 25 ( OH ) D levels ( 57.7 20.5 vs. 14.1 6.2 ng/ml , p < 0.0001 ) and a decrease in PTH levels ( 32.4 16.4 vs. 52.9 18.4 pg/ml , p = 0.003 ) in subjects in the intervention arm when compared to the placebo arm .