Table 3.
Factors associated with 25(OH)D blood levels and the risk of 25(OH)D deficiency (n = 226)
| Ln[25(OH)D] (continuous)
|
Lowest tertile (dichotomous)b OR (95% CI) | ||
|---|---|---|---|
| β (se) | P value | ||
| Univariatea | |||
| Gender (relative to males) | −0.31 (0.09) | 0.0006 | 2.4 (1.1–5.0) |
| Season (relative to summer) | −0.77 (0.05) | <0.0001 | 21.6 (8.2–52.1) |
| Student status (relative to students) | −0.25 (0.13) | 0.0505 | 1.9 (0.8–4.5) |
| Physical activity (IPAQ) | |||
| Low | − | − | − |
| Medium | −0.02 (0.06) | 0.7445 | 1.6 (0.8–2.9) |
| High | 0.15 (0.06)d | 0.0092 | 0.7 (0.4–1.2) |
| Multivariatec | |||
| Gender (relative to males) | −0.27 (0.06) | <0.0001 | 5.0 (1.8–13.9) |
| Season (relative to summer) | −0.76 (0.07) | <0.0001 | 37.9 (12.3–116.4) |
| Student status (relative to students) | 0.06 (0.10) | 0.5518 | 0.3 (0.08–1.3) |
| Physical activity (IPAQ) | |||
| Low | − | − | − |
| Medium | −0.002 (0.04) | 0.9773 | 1.8 (0.8–4.3) |
| High | 0.12 (0.05)d | 0.0185 | 0.9 (0.3–2.8) |
a
All models are age adjusted.
b
Tertiles are Tanner stage independent, and median value for the low tertile is 8.8 ng/ml.
c
All factors are included in the model. No significant interaction effects were found.
d
The trend was significant at Ptrend <0.05.