Groups | Â | Number of studies | Total number of participants | Median (%) | Minimum (%) | Maximum (%) | Pooled prevalence (%) (95% CI) |
---|---|---|---|---|---|---|---|
≥ 18 y |  |  |  |  |  |  |  |
Sex | Male | 15 | 80145 | 44.3 | 25.8 | 68.9 | 45.6 (40.0 ~ 51.4) |
 | Female | 15 | 96864 | 33.7 | 14.6 | 56.4 | 35.9 (29.5 ~ 42.8) |
Region | Eastern China | 8 | 58092 | 40 | 23.3 | 60.7 | 40.0 (32.6 ~ 47.9) |
 | Central China | 4 | 15655 | 44.2 | 31.9 | 60.7 | 45.1 (35.2 ~ 55.5) |
 | Western China | 6 | 31896 | 34.6 | 26.1 | 75.9 | 41.9 (28.9 ~ 56.1) |
≥ 30 y |  |  |  |  |  |  |  |
Sex | Male | 3 | 5442 | 26.2 | 24.9 | 45.3 | 31.5 (20.7 ~ 44.8) |
 | Female | 3 | 7772 | 30.2 | 29.9 | 43 | 34.1 (26.1 ~ 43.3) |
Region | Eastern China | 3 | 4290 | 44.2 | 43.9 | 59.9 | 49.3 (39.4 ~ 59.3) |
 | Central China | 4 | 29370 | 36.3 | 27.8 | 46.4 | 36.3 (26.6 ~ 47.1) |
 | Western China | 2 | 2232 | 39.9 | 23.3 | 56.5 | 38.5 (13.1 ~ 72.2) |
Total | Â | Â | Â | Â | Â | Â | Â |
Sex | Male | 18 | 85587 | 43.7 | 24.9 | 68.9 | 43.2 (37.4 ~ 49.1) |
 | Female | 18 | 104636 | 32.7 | 14.6 | 56.4 | 35.6 (30.0 ~ 41.7) |
Region | Eastern China | 11 | 62382 | 44.2 | 23.3 | 60.7 | 42.5 (36.1 ~ 49.2) |
 | Central China | 8 | 45025 | 43.8 | 27.8 | 60.7 | 40.6 (33.9 ~ 47.7) |
 | Western China | 8 | 34128 | 34.6 | 23.3 | 75.9 | 41.0 (30.0 ~ 53.0) |