Fig. 3.

Forest plot of the pooled prevalence of VitD deficiency (< 30 nmol/L) and VitD inadequacy (< 50 nmol/L) of children and adolescents in Mainland of China. N is the total number of subjects of the studies, and case is the number of subjects with low VitD status. The forest plot was drawn based on the observational prevalence with 95%CrI of each study, and the pooled prevalence with 95%CrI was estimated using the Hierarchical Bayesian models. For VitD deficiency, the between-study variance (${\mathit{\sigma }}^2$) and 95%CrI was 2.4 (0.7–7.5). For VitD inadequacy, the between-study variance (${\mathit{\sigma }}^2$) and 95%CrI was 1.6 (1.0–2.5). Abbreviations: VitD = Vitamin D; CrI = Credible Interval.