Table 1.
Basic characteristics of the participants
| Variables | Group | Male (n = 7141) |
Female (n = 14962) |
All participants (n = 22103) |
|---|---|---|---|---|
| Age, years | ≤ 44 | 1316(18.43) | 3419(22.85) | 4735(21.42) |
| 45–59 | 3579(50.12) | 7783(52.02) | 11362(51.40) | |
| ≥ 60 | 2246(31.45) | 3760(25.13) | 6006(27.17) | |
| Ethnic Groups | Han nationality | 3462(48.48) | 6597(44.09) | 10059(45.51) |
| Yi nationality | 1915(26.82) | 4014(26.83) | 5929(26.82) | |
| Bai nationality | 1764(24.70) | 4351(29.08) | 6115(27.67) | |
| Household registration | Rural | 6462(90.49) | 14056(93.94) | 20518(92.96) |
| Urban | 579(8.11) | 736(4.92) | 1315(5.96) | |
| Unifieda | 89(1.25) | 150(1.00) | 239(1.08) | |
| Annual household income, ¥ | < 1200 | 1460(20.45) | 3138(20.97) | 4598(20.83) |
| 12000–19999 | 1527(21.38) | 3655(24.43) | 5182(23.48) | |
| 20000–59999 | 2979(41.72) | 6206(41.48) | 9185(41.62) | |
| 60000–99999 | 676(9.47) | 1110(7.42) | 1786(8.09) | |
| 100000–199999 | 380(5.32) | 677(4.52) | 1057(4.79) | |
| ≥ 200000 | 113(1.58) | 149(1.00) | 262(1.19) | |
| Educational level | No formal | 781(10.94) | 5691(38.04) | 6472(29.28) |
| Primary school | 2884(40.39) | 5756(38.47) | 8640(39.09) | |
| Junior high school | 2674(37.45) | 2704(18.07) | 5378(24.33) | |
| high school | 566(7.93) | 487(3.25) | 1053(4.76) | |
| College or above | 236(3.3) | 323(2.16) | 559(2.53) |
aThe unified resident household registration that does not distinguish between urban and rural household registration