Sensitivity analyses of the prevalence of passive smoking in China
| Outcome | Number of studies | Number of non-smokers | Prevalence % (95% CI) | I2, % |
|---|---|---|---|---|
| All included studies | 46 | 381 580 | 48.7 (44.8 to 52.5) | 99.8 |
| National survey | 6 | 219 243 | 45.6 (36.8 to 54.3) | 99.9 |
| Non-national survey | ||||
| Non-national survey (sample size ≥1000) | 25 | 153 709 | 46.6 (40.3 to 52.9) | 99.9 |
| Non-national survey (sample size <1000) | 15 | 8628 | 53.5 (44.5 to 62.4) | 98.8 |
| Overall | 40 | 162 337 | 49.1 (44.1 to 54.1) | 99.8 |