highly significantP < 0.001
In our study, subjects in the intervention group were given vitamin D 3 supplements (10 μg/d), and this resulted in a highly significant increase in serum total 25(OH)D ( P < 0.001) and a highly significant reduction in PTH concentrations ( P < 0.001) in the whole intervention group (but not in the osteoporosis subgroup) compared with the control group ( Table 3 ).