Table 1. Populations (in millions) and percentage distribution by demographic characteristics in the surveillance sites, compared with two reference populations Zhejiang province and China, 2012.
| Surveillance Sites | Zhejiang | China | |
|---|---|---|---|
| Gendera | |||
| Male | 8.5 (50.9%) | 24.0 (50.7%) | 693.2 (51.2%) |
| Female | 8.2 (49.1%) | 23.3 (49.3%) | 660.8 (48.8%) |
| Residence a§ | |||
| Urban | 5.9 (35.3%) | 15.5 (32.8%) | 403.2 (29.8%) |
| Rural | 10.8 (64.7%) | 31.8 (67.2%) | 950.8 (70.2%) |
| Age groupsa | |||
| <35 years | 7.1 (42.5%) | 19.0 (40.2%) | 643.1 (47.5%) |
| 35–64 | 7.7 (46.1%) | 23.6 (49.9%) | 583.6 (43.1%) |
| > = 65 years | 1.9 (11.4%) | 4.7 (9.9%) | 127.3 (9.40%) |
| Total | 16.7 (100.0%) | 47.3 (100.0%) | 1354 (100.0%) |
a Pearson chi-square test was used to compare the population of surveillance sites with the total population of Zhejiang, and China respectively regarding gender, residence status and age. No significant difference was found (p>0.05).
§Only participants living in the urban districts of prefectures were registered as urban residents; participants living in rural counties, towns and villages were registered as rural residents.