At the end of the study medication period , the D + group had a significantly higher median serum ( s - ) 25OHD concentration ( 76 ( 65 ; 93 ) ( lower ; upper interquartile ranges ) vs 48 ( 40 ; 62 ) nmol/l , P < 0.001 ) and a lower plasma ( p - ) parathyroid hormone concentration ( 40 ( 34 ; 52 ) vs 49 ( 38 ; 66 ) ng/l , P = 0.01 ) than the D - group .