Characteristics | Model 1 (No covariates) | Model 2 (Covariates) | ||||
---|---|---|---|---|---|---|
OR (SE) | 95% CI | P | OR (SE) | 95%CI | P | |
Socioeconomic status | ||||||
 Educational attainment | ||||||
  Primary school or below | Ref. |  |  | Ref. |  |  |
  Middle school | 1.72 (0.23) | 1.33, 2.22 | < 0.001 | 1.21 (0.16) | 0.93, 1.57 | 0.154 |
  High school | 2.15 (0.31) | 1.63, 2.85 | < 0.001 | 1.48 (0.24) | 1.07, 2.03 | 0.017 |
  University or above | 2.76 (0.38) | 2.11, 3.62 | < 0.001 | 2.04 (0.36) | 1.45, 2.88 | 0.001 |
 Economic status | ||||||
  Quartile 1 | Ref. |  |  | Ref. |  |  |
  Quartile 2 | 1.41 (0.16) | 1.14, 1.76 | 0.002 | 1.15 (0.14) | 0.90, 1.47 | 0.250 |
  Quartile 3 | 1.62 (0.16) | 1.34, 1.97 | < 0.001 | 1.28 (0.16) | 1.01, 1.62 | 0.044 |
  Quartile 4 | 1.67 (0.24) | 1.25, 2.22 | < 0.001 | 1.37 (0.20) | 1.02, 1.83 | 0.035 |