| Independent variable |
β | SE | Wald χ2 | p | 95%CI |
|---|---|---|---|---|---|
| (Intercept) | -3.182 | 0.630 | 25.511 | < 0.001 | -4.417,-1.947 |
| S1 | 0.708 | 0.210 | 11.389 | < 0.001 | 0.297, 1.119 |
| S2 | 1.680 | 0.277 | 36.699 | < 0.001 | 1.137, 2.224 |
| S3 | 1.741 | 0.223 | 60.824 | < 0.001 | 1.303, 2.178 |
| S4 | 1.702 | 0.329 | 26.691 | < 0.001 | 1.056, 2.347 |
| S>3 | 1.414 | 0.892 | 2.511 | 0.113 | -0.335, 3.162 |
| S>4 | 0.982 | 1.173 | 0.701 | 0.402 | -1.316, 3.280 |