Table 1.
Comparisons of socio-demographic characteristics between case and control
| Variables | Case | Control | P | Crud OR (95%CI) |
|---|---|---|---|---|
| Age(years) | 50.6 ± 14.0 | 46.1 ± 12.7 | < 0.001 | 1.03 (1.02,1.04) |
| Gender | ||||
| Male | 292 (51.5) | 275 (48.5) | 0.100 | Ref. |
| Female | 195 (46.2) | 227 (53.8) | 0.81 (0.63,1.04) | |
| Education level | ||||
| Senior high school or under | 88 (47.6) | 97 (52.4) | 0.603 | Ref. |
| Bachelor degree or above | 399 (49.7) | 408 (50.3) | 1.09 (0.79,1.50) | |
| Family average Monthly income (RMB: yuan) | ||||
| < 2000 | 23 (5.4) | 27 (6.6) | 0.207 | Ref. |
| 2000~ 3999 | 121 (28.3) | 95 (23.2) | 1.50 (0.81,2.72) | |
| ≥4000 | 283 (66.3) | 288 (70.2) | 1.15 (0.65,2.06) | |
Ref. The reference group
Binary logistic regression was used to obtain the crud odds ratios OR and its 95% CI