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Table 3 Regression analysis of risk factors for Hypovitaminosis D

From: Association of serum 25-Hydroxyvitamin D with Vitamin D intervention and outdoor activity among children in North China: an observational study

  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