Table 5 Age and sex distribution in the general population and in study participants in each region.
| Â | Shanghai (%) | Beijing (%) | Wuhan (%) | Xi'an (%) | Guangzhou (%) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Â | Populationa (n = 13.5 m) | Participants (n = 3151) | Populationb (n = 11.8 m) | Participants (n = 3168) | Populationb (n = 7.8 m) | Participants (n = 3283) | Populationa (n = 7.3 m) | Participants (n = 3266) | Populationb (n = 7.3 m) | Participants (n = 3210) |
Female | 50.6 | 55.5 | 50.0 | 53.1 | 49.7 | 52.4 | 50.0 | 50.4 | 45.4 | 49.6 |
Urban | 54.2 | 49.9 | 57.5 | 49.0 | 58.6 | 50.4 | 50.4 | 49.5 | 55.7 | 52.3 |
Age (years) | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
   18-29 | 13.3 | 11.1 | 25.6 | 23.9 | 31.1 | 26.5 | 27.8 | 24.8 | 31.9 | 27.8 |
   30-39 | 18.8 | 15.8 | 21.5 | 21.1 | 19.6 | 22.8 | 25.7 | 25.2 | 28.5 | 29.2 |
   40-49 | 30.2 | 33.8 | 22.0 | 23.1 | 20.3 | 20.8 | 19.9 | 21.2 | 17.8 | 19.9 |
   50-59 | 16.4 | 18.9 | 15.1 | 16.0 | 15.5 | 15.4 | 12.9 | 13.8 | 11.5 | 12.7 |
   60-69 | 12.4 | 12.1 | 9.3 | 9.8 | 8.0 | 8.5 | 8.8 | 9.5 | 6.3 | 7.0 |
   70-80 | 9.1 | 8.3 | 6.5 | 6.1 | 5.5 | 6.1 | 5.0 | 5.4 | 4.0 | 3.5 |