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Table 1 Characteristics of all subjects

From: Serum parathyroid hormone is related to genetic variation in vitamin D binding protein with respect to total, free, and bioavailable 25-hydroxyvitamin D in middle-aged Caucasians – a cross-sectional study

Variable N = 622
Men (%) 32
Women (%) 68
Age (years) 42 ± 3
Height (cm) 1.70 ± 0.1
Weight (kg) 76 ± 14
Body mass index (kg/m2) 26.2 ± 4.3
Calcium intake (mg/day) 1253 ± 530
Vitamin D intake (μg) 15.1 ± 13
S-25(OH)D (nmol/L) 55.7 ± 19.2
Free 25(OH)D (pmol/L) 12.2 ± 4.9
Bioavailable 25(OH)D (nmol/L) 4.80 ± 2.0
S-PTH (ng/L) 54.6 ± 25
S-DBP (mg/L) 368 ± 88
S-Albumin (g/L) 43.7 ± 3.0
All physical activity (min/week) 481 ± 372
History of regular smokinga (%) 46
Current Smokers:
Cigarettes per day
 1–5 17 %
 6 or more 83 %
  1. Values are presented as mean ± SD
  2. aat least one cigarette per day for 6 months