At the end of the study medication period , the D + group had a significantly higher median serum ( s - ) @OHD concentration ( @ ( @ ; @ ) ( lower ; upper interquartile ranges ) vs @ ( @ ; @ ) nmol/l , P < @ ) and a lower plasma ( p - ) parathyroid hormone concentration ( @ ( @ ; @ ) vs @ ( @ ; @ ) ng/l , P = @ ) than the D - group .