From: Association of serum 25-Hydroxyvitamin D with Vitamin D intervention and outdoor activity among children in North China: an observational study
Intervention
Model 1
Model 2
Model 3
No intervention
1
Supplementation intervention
0.435 (0.415, 0.455)
0.423 (0.404, 0.443)
Therapeutic intervention
0.202 (0.191, 0.214)
0.191 (0.180, 0.202)