Table 2.
Prevalence of childhood obesity, 95% confidence interval (CI) and heterogeneity (I2) according to the study design, sample source and region of studies.
| Subgroup | No. of studies | No. of children | Prevalence, % [95% CI] | I2 (%) |
|---|---|---|---|---|
| Study design | ||||
| Cross-sectional | 48 | 112,023 | 8.1 [7.9−8.2] | 98.3 |
| Cohort | 4 | 9,707 | 9.7 [8.9−10.6] | 99.2 |
| Sample source | ||||
| School-based | ||||
| Public and private schools | 25 | 26,865 | 9.7 [9.3−10.1] | 97.0 |
| Public schools | 7 | 6,421 | 12.6 [11.7−13.4] | 93.0 |
| Population-based | ||||
| Household | 15 | 78,505 | 7.3 [7.1−7.5] | 99.0 |
| Maternity | 5 | 9,939 | 9.5 [8.7−10.4] | 99.0 |
| Regiona | ||||
| North | 5 | 12,443 | 6.7 [6.3−7.2] | 98.8 |
| Northeast | 15 | 38,193 | 6.4 [6.2−6.7] | 98.1 |
| Southeast | 18 | 18,497 | 10.6 [10.2−11.0] | 98.2 |
| South | 21 | 35,230 | 10.1 [9.7−10.4] | 97.7 |
| Midwest | 5 | 11,805 | 9.7 [9.1−10.2] | 98.1 |
a
The analysis included disaggregated data from each region if available in a nationwide study.