PTH and vitamin D deficiency: In the MORE study, the groups with vitamin D deficiency (serum 25OHD <25 nmol/L, n = 297 and 25OHD 25 to 50 nmol/L, n = 1721) both show significantly higher serum PTH (4.8 ± 2.2 and 4.1 ± 1.8 pmol/L, respectively) compared with people with 25OHD >50 nmol/L (n = 4982, serum PTH 3.5 pmol/L).