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Table 1 Demographic and clinical characteristics of participants at baseline

From: Vitamin D supplementation for treatment of seasonal affective symptoms in healthcare professionals: a double-blind randomised placebo-controlled trial

  Intervention group n = 22 Control group n = 21 Both groups n = 43
Female, n (%) 16 (100) 16 (89) 32 (94)
Age mean (SD), years 44.2 (11.5) 44.4 (10.0) 44.3 (10.6)
Smokers, n (%) 5 (31) 3 (17) 8 (24)
PTH mean (SD), nmol/l 6.1 (1.8) 5.6 (2.0) 5.9 (1.9)
Skin pigmentation mean (SD) 3.0 (1.0) 2.7 (1.1) 2.9 (1.0)
Absenteeism mean (SD), days 1.5 (2.7) 0.6 (1.2) 1.0 (2.0)
Waist circumference mean (SD), cm 90.3 (12.7) 82.5 (8.0) 86.1 (11.0)
Normal 25(OH)D (>50), n (%) 15 (68) 16 (76) 31 (72)
Insufficient 25(OH)D (25–50), n (%) 7 (32) 5 (24) 12 (28)
Deficient 25(OH)D (<25), n (%) 0 (0) 0 (0) 0 (0)