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Table 6 Logistic regression analysis of the association of outdoor time with hypovitaminosis D

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

Outdoor time (min/d) Model 1 Model 2 Model 3
< 30 1 1 1
30–60 0.696 (0.663, 0.731) 0.697 (0.663, 0.732) 0.737 (0.701, 0.776)
> 60 0.533 (0.508, 0.560) 0.534 (0.508, 0.560) 0.479 (0.456, 0.504)
  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 and intervention methods on the basis of model 2