Table 1.
Characteristics of the study participants at baseline by vitamin D group
| Variable | Vitamin D sufficient (N = 14) | Vitamin D insufficient (N = 13) | P‐value |
|---|---|---|---|
| Days from screening to entry (Mean ± SD) | 37.1 ± 26.9 (N = 14) | 54.8 ± 27.1 (N = 13) | 0.062a |
| Age (years) (Mean ± SD) | 20.5 ± 2.4 (N = 14) | 21.7 ± 2.0 (N = 13) | 0.13a |
| S‐25[OH]D (nmol/L) (Mean ± SD) | 99.9 ± 24.1 (N = 14) | 32.0 ± 16.5 (N = 13) | 0.0001a |
| Weight (kg) (Mean ± SD) | 70.1 ± 11.1 (N = 14) | 78.4 ± 15.4 (N = 13) | 0.23a |
| Height (m) (Mean ± SD) | 176 ± 9.7 (N = 14) | 174.2 ± 6.0 (N = 13) | 0.56a |
| Calcium (pmol/L) (Mean ± SD) | 1.24 ± 0.04 (N = 13) | 1.24 ± 0.02 (N = 12) | 0.58a |
| iPTH (pg/mL) (Median (IQR)) | 39 (16‐83) (N = 13) | 56 (29–130) (N = 12) | |
| Systolic BP (rest)(mmHg) (Mean ± SD) | 116 ± 11.2 (N = 14) | 123 ± 15.2 (N = 13) | 0.11a |
| Diastolic BP (rest)(mmHg) (Mean ± SD) | 66.1 ± 6.3 (N = 14) | 72.8 ± 12.0 (N = 13) | 0.11a |
| Heart rate (rest)/bpm (Mean ± SD) | 56.6 ± 7.2 (N = 14) | 67.7 ± 10.1 (N = 13) | 0.007a |
| Norepinephrine, rest (nmol/L)(Mean ± SD) | 0.9 ± 0.3 (N = 14) | 1.6 ± 0.5 (N = 13) | 0.0002a |
| Epinephrine, rest (nmol/L)(Mean ± SD) | 0.1 ± 0.0 (N = 13) | 0.1 ± 0.0 (N = 13) | 0.66a |
| Sex | |||
| Women | 10 | 6 | 0.18b |
| Men | 4 | 7 | |
| Tobacco (last week) | |||
| No | 13 | 10 | 0.24b |
| Yes | 1 | 3 | |
| Alcohol consumption (last week) | |||
| No | 8 | 6 | 0.57b |
| Yes | 6 | 7 | |
| Physical activity (h/week) | |||
| 0–2 | 1 | 8 | 0.011b |
| 2–7 | 5 | 2 | |
| 7 and above | 8 | 3 | |
a
Based on Mann–Whitney test.
b
Based on Chi‐square test.