Table 2.
The difference in characteristics between subjects with an optimal (≥50 nmol) and suboptimal (<50 nmol) 25(OH)D level. PTH, parathyroid; IPAQ, International Physical Activity Questionnaire.
| Vitamin D status | Subjects with 25(OH)D Level < 50 nmol (n = 87) | Subjects with 25(OH)D Level ≥ 50 nmol (n = 296) | p-value | ||
|---|---|---|---|---|---|
| Variable | Mean | SD | Mean | SD | |
| Age (years) | 40.0 | 16.2 | 44.9 | 15.0 | 0.009 |
| Height (cm) | 167.2 | 6.2 | 167.8 | 6.6 | 0.519 |
| Percentage of Body Fat (%) | 23.8 | 6.4 | 21.8 | 6.1 | 0.011 |
| Waist Circumference (cm) | 90.2 | 10.6 | 87.5 | 10.1 | 0.027 |
| Calcaneal Speed of Sound (m/s) | 1522.0 | 29.2 | 1520.2 | 27.3 | 0.292 a |
| Serum Total Calcium (mmol/L) | 2.3 | 0.1 | 2.3 | 0.1 | 0.120 |
| Serum Inorganic Phosphate (mmol/L) | 1.1 | 0.1 | 1.1 | 0.1 | 0.037 |
| Variable | Median | IQR | Median | IQR | p-value |
| Body Weight (kg) | 69.9 | 20.0 | 67.0 | 16.4 | 0.012 |
| Body Mass Index (kg/m2) | 25.6 | 6.6 | 24.0 | 5.3 | 0.002 |
| Serum 25(OH)D Level (nmol/L) | 44.3 | 6.8 | 61.6 | 11.8 | <0.001 |
| Serum PTH Level | 43.3 | 26.5 | 43.0 | 20.7 | 0.279 b |
| IPAQ Score (MET-min/week) | 1580.0 | 2284.0 | 1386.0 | 2730.0 | 0.465 b |
All variables are tested using the independent t-test, unless indicated otherwise. a Speed of sound (SOS) is tested using univariate ANOVA, adjusted for age and BMI; b variables are tested using the Mann-Whitney U-test, because they are skewed and cannot be transformed; p-values in bold are significant.