Table 1. Comparison of demographic characteristics of the study population and the general adults population in China, 2010.
| Characteristics | N | % Study population, N = 3541 | % Total population, N = 933785258† |
|---|---|---|---|
| Age group (years) | |||
| 18–25 | 642 | 18.1 | 13.6† |
| 26–35 | 1673 | 47.2 | 21.2† |
| 36–45 | 860 | 24.3 | 26.0† |
| 46–70 | 366 | 10.3 | 39.1† |
| Gender | |||
| Male | 1702 | 48.1 | 50.8 |
| Female | 1839 | 51.9 | 49.2 |
| Average annually household income (CNY) ‡ | |||
| <50000 | 841 | 23.8 | 39.0 |
| 50001–120,000 | 1341 | 37.9 | 42.9 |
| >120000 | 1359 | 38.4 | 18.1 |
| Region¶ | |||
| East China | 1191 | 33.6 | 29.5 |
| South China | 417 | 11.8 | 16.8 |
| West China | 164 | 4.6 | 21.8 |
| North China | 1460 | 41.2 | 20.6 |
| Central China | 309 | 8.7 | 11.3 |
† Total number of adults 20 to 70 years of age according to China national census in 2010 [22].
‡ China household income distribution: Urban [23].
¶ Northern region (Beijing, Tianjian, Hebei, Shanxi, Inner Mogolia, Liaoning, Jilin); Central (Henan, Hubei); East region (Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Shandong, Taiwan); Southern region (Hunan, Guangdong, Guangxi, Hainan, Hong Kong, Macao); Western region (Chongqing, Sichuan, Guizhou, Yunnan, Tibet, Shannxi, Gansu, Qinghai, Ninxia, Xinjiang).