The average serum vitamin D value in the first measurement was 40.9 nmol/L and 38.1 nmol/L in the second measurement (average difference 2.8 nmol/L).
Meðaltal fyrstu D-vítamínmælingar var 40,9 nmól/L og meðaltal annarrar mælingar var 38,1 nmól/L (meðalmunur 2,8 nmól/L).