Characteristics | Class 2 (n = 157) | P value | Class 3 (n = 390) | P value | ||
---|---|---|---|---|---|---|
OR | 95% C.I | OR | 95% C.I | |||
Educational background | Â | Â | Â | Â | Â | Â |
 Primary school or below | Ref |  |  | Ref |  |  |
 Secondary school | 0.86 | 0.56–1.72 | 0.62 | 0.77 | 0.58–2.11 | 0.56 |
 High school | 1.32 | 0.79–1.91 | 0.01 | 1.72 | 1.34–2.87 | < 0.00 |
 University or above | 1.67 | 0.87–2.74 | 0.64 | 2.35 | 1.25–3.36 | < 0.00 |
Employment status | Â | Â | Â | Â | Â | Â |
 Unemployed | Ref |  |  | Ref |  |  |
 Retired | 2.66 | 1.62–3.52 | < 0.00 | 1.42 | 0.51–2.57 | 0.35 |
 Employed | 1.32 | 0.43–2.67 | 0.42 | 3.31 | 0.68–5.27 | < 0.00 |
Monthly family income | Â | Â | Â | Â | Â | Â |
 ≤ ¥6000 | Ref |  |  | Ref |  |  |
 > ¥6000 | 1.14 | 0.33–1.87 | 0.02 | 2.43 | 0.54–3.87 | < 0.00 |
Health insurance | Â | Â | Â | Â | Â | Â |
 No | Ref |  |  | Ref |  |  |
 Yes | 1.22 | 0.77–2.13 | 0.65 | 1.67 | 0.63–2.53 | 0.01 |