Age, height, weight, dietary vitamin D intake, duration of daily sunlight exposure, the percentage of body surface area exposed by the most commonly worn clothes during daytime, and biochemical parameters of white and non-white girls
| White girls (n = 14) | Non-white girls (n = 37) | p value | |
|---|---|---|---|
| Data are presented as median (range) and the differences in the two groups were compared using the Mann-Whitney U test. | |||
| *Normal range in parentheses. | |||
| †Three non-white girls had PTH levels outside the normal range (see table 2). | |||
| ‡Reference range of serum alkaline phosphatase activity depends on age and stage of pubertal development. | |||
| §Adult reference range: 48–120 pmol/l. | |||
| Age (years) | 15.2 (14.8–16.6) | 15.3 (14.7–16.3) | 0.4 |
| Weight (kg) | 53.0 (45–76) | 56.5 (42–78.5) | 0.2 |
| Height (cm) | 159.5 (150–170) | 158.0 (148.7–168.7) | 0.3 |
| Body mass index (kg/m2) | 20.6 (17.8–30.8) | 25.0 (17.0–31.8) | 0.09 |
| Dietary vitamin D intake (μg/day) | 1.2 (0.3–5.6) | 1.4 (0.4–6.0) | 0.6 |
| Daily sun exposure (min) | 60 (34–60) | 34 (15–60) | 0.003 |
| % Body surface area exposed | 19 (9–33) | 9 (7–43) | 0.001 |
| Time taken to perform the Gower’s test (sec) | 2.6 (2.2–3.5) | 2.7 (2.0–4.4) | 0.6 |
| Grip strength (kg) | 16.4 (9–21) | 16.7 (5.3–30.6) | 0.6 |
| Ca (mmol/l) (2.2–2.6 mmol/l)* | 2.4 (2.3–2.6) | 2.4 (2.2–2.7) | 0.2 |
| P (mmol/) (0.7–1.4 mmol/l)* | 1.1 (1.0–1.4) | 1.1 (0.8–1.8) | 0.5 |
| PTH (pmol/l)*† (1.1–6.4 pmol/l) | 2.8 (1.0–3.7) | 3.4 (1.7–34.2) | 0.02 |
| Alkaline phosphatase activity (IU)‡ | 232 (156–773) | 226 (124–597) | 0.5 |
| 25(OH)D (nmol/l) | 37.3 (18.3–73.3) | 14.8 (5.8–42.8) | <0.001 |
| 1,25(OH)2D (pmol/l)§ | 87.6 (50.4–115.2) | 93.6 (60–139.2) | 0.2 |