| NHSLA risk-management rating | Interpretation of ratings | No of hospitals | Mean reporting rate per 100 bed days (95% CI) | Significant differences in reporting rates |
| Level 0 | Not achieved Level 1 | 1 | 3.89 (NA) | Between Levels 1 and 3: p = 0.026Between Levels 2 and 3: p = 0.037 |
| Level 1 | Effective risk management systems and processes established | 88 | 0.82 (0.68 to 0.96) | |
| Level 2 | Systems described for Level 1 have been implemented | 49 | 0.84 (0.61 to 1.06) | |
| Level 3 | Organisation is monitoring compliance with systems and acting on findings | 10 | 1.36 (1.06 to 1.66) |
NA, not applicable.