Number of risk factors or fusion levels (N = 142).
| Variable | n (%) |
| Number of risk factors | |
| 1 | 78 (54.9) |
| ≥2 | 64 (45.1) |
| ≥3 | 17 (12.0) |
| ≥4 | 2 (1.4) |
| Number of levels | |
| 1 | 10 (7.0) |
| 2 | 71 (50.0) |
| 3 | 39 (27.5) |
| 4 | 11 (7.8) |
| 5 | 5 (3.5) |
| 7 | 1 (0.7) |
| 8 | 2 (1.4) |
| 9 | 2 (1.4) |
| 15 | 1 (0.7) |