Winter | Summer | p Value | |
Vitamin D (nmol/l) | 35.1 (10.5) | 49.3 (13.0) | 0.000 |
PTH (μg/l) | 5.4 (1.7) | 4.7 (1.6) | 0.018 |
Calcium (mmol/l) | 2.4 (0.1) | 2.4 (0.1) | 0.239 |
Corrected calcium (mmol/l) | 2.4 (0.1) | 2.4 (0.1) | 0.375 |
FEV1 (l) | 1.18 (0.41) | 1.23 (0.43) | 0.121 |
FVC (l) | 2.66 (0.66) | 2.73 (0.72) | 0.420 |
PEF (l/min) | 205 (82) | 214 (87) | 0.650 |
There was a significant seasonal difference for vitamin D and parathyroid hormone.
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; PEF, peak expiratory flow; PTH, parathormone.