Table 3 Regression analysis of risk factors for Hypovitaminosis D
|  | OR (95% CI, n = 55,925) | P Value |
|---|---|---|
Gender | ||
 Male | 1 |  |
 Female | 1.155 (1.108, 1.205) | < 0.001 |
Age (years) | ||
 0 < age < 1 | 1 |  |
 1 ≤ age < 3 | 1.534 (1.457, 1.615) | < 0.001 |
 3 ≤ age < 6 | 5.779 (5.437, 6.142) | < 0.001 |
 6 ≤ age < 12 | 12.685 (11.740, 13.707) | < 0.001 |
 12 ≤ age < 18 | 15.932 (13.738, 18.476) | < 0.001 |
Ethnic group | ||
 Han | 1 |  |
 Other | 1.709 (0.923, 1.260) | 0.341 |
BMI for age | ||
 Normal | 1 |  |
 Overweight and obesity | 1.219 (1.046, 1.421) | < 0.001 |
Season group | ||
 Summer | 1 |  |
 Spring | 1.079 (1.017, 1.145) | 0.141 |
 Autumn | 0.957 (0.903, 1.015) | 0.012 |
 Winter | 1.189 (1.113, 1.270) | < 0.001 |
Outdoor time | ||
  < 30 min/d | 1 |  |
 30–60 min/d | 0.756 (0.718, 0.797) | < 0.001 |
  > 60 min/d | 0.482 (0.458, 0.508) | < 0.001 |
Intervention | ||
 None | 1 |  |
 Supplementation intervention | 0.416 (0.396, 0.437) | < 0.001 |
 Therapeutic intervention | 0.183 (0.173, 0.194) | < 0.001 |