| OR (95% CI) | P-value |
---|---|---|
<  20 vs 20 ~ 25 | 1.97 (1.20–3.25) | 0.008 |
25 ~ 30 vs 20 ~ 25 | 1.66 (1.26–2.19) | <  0.001 |
30 ~ 35 vs 20 ~ 25 | 2.24 (1.67–2.99) | <  0.001 |
35 ~ 40 vs 20 ~ 25 | 3.90 (2.75–5.54) | <  0.001 |
≥ 40 vs 20 ~ 25 | 3.33 (1.87–5.92) | <  0.001 |
Elementary school or below vs college or university | 3.53 (1.43–8.75) | 0.006 |
Middle school vs college or university | 1.53 (1.22–1.92) | <  0.001 |
High school vs college or university | 1.40 (1.15–1.72) | 0.001 |
Postgraduate degree vs college or university | 0.84 (0.61–1.16) | 0.299 |
PhD degree vs college or university | 0.34 (0.12–1.02) | 0.054 |
North vs South | 1.37 (1.16–1.62) | <  0.001 |