Table 3.
Subgroup analysis of included studies.
| Numbers of Study | Proportion (95% CI) | I2 | P | ||
|---|---|---|---|---|---|
| Regional disparities | Western China | 16 | 7.15% (95%CI 5.82–8.48%) | 99.6% | 0.4592 |
| Eastern China | 20 | 6.63% (95% CI 5.20–8.06%) | 99.9% | ||
| Central China | 6 | 5.23% (95%CI 2.50–7.96%) | 99.6% | ||
| Economic level | 1–10 | 24 | 6.78% (95% CI 5.66–7.90%) | 99.9% | 0.4968 |
| 21–31 | 11 | 6.46% (95% CI 4.35–8.58%) | 99.8% | ||
| 11–20 | 7 | 6.64% (95% CI 3.87–8.58%) | 99.9% | ||
| Source of data | Regional investigation | 11 | 7.48% (95% CI 5.69–9.27%) | 99.9% | 0.2906 |
| Medical institution | 31 | 6.35% (95% CI 5.27–7.43%) | 99.8% | ||
| Study design | Cross-sectional study | 35 | 6.65% (95% CI 5.71–7.59%) | 99.9% | 0.9606 |
| Cohort study | 7 | 6.57% (95% CI 3.45–9.69%) | 99.9% |