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Table 5 Logistic regression analysis of the association of vitamin D intervention methods with hypovitaminosis D in children with varying outdoor time

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

Intervention methods Model 1 Model 2 Model 3
> 60 min/d
 No intervention 1 1 1
 Supplementation intervention 0.508 (0.470, 0.549) 0.508 (0.469, 0.549) 0.508 (0.470, 0.550)
 Therapeutic intervention 0.196 (0.177, 0.216) 0.196 (0.177, 0.216) 0.196 (0.178, 0.216)
30–60 min/d
 No intervention 1 1 1
 Supplementation intervention 0.362 (0.332, 0.394) 0.362 (0.332, 0.394) 0.361 (0.332, 0.394)
 Therapeutic intervention 0.183 (0.164, 0.205) 0.184 (0.164, 0.205) 0.183 (0.164, 0.205)
< 30 min/d
 No intervention 1 1 1
 Supplementation intervention 0.376 (0.345, 0.411) 0.377 (0.346, 0.411) 0.377 (0.346, 0.411)
 Therapeutic intervention 0.176 (0.160, 0.194) 0.174 (0.159, 0.192) 0.174 (0.159, 0.192)
  1. Associations were examined using multivariable logistic regression. Model 1: adjusted for age and sex. Model 2: adjusted for BMI for age on the basis of model 1. Model 3: adjusted for season on the basis of model 2