Population-based probability of ulcer at 2 years for each CPR score, calculated using Pavlou’s method for population-average estimates
| CPR score | N patients | Probability of ulcer at 2 years | 95% CI |
| 0 | 4646 | 0.024 | (0.014 to 0.039) |
| 1 | 2406 | 0.060 | (0.035 to 0.095) |
| 2 | 676 | 0.140 | (0.085 to 0.213) |
| 3 | 358 | 0.292 | (0.192 to 0.410) |
| 4 | 169 | 0.511 | (0.379 to 0.641) |
CPR, clinical prediction rule.