Variance explained by patient and practice characteristics
| Outcome | Total variance | % of variance explained |
| Experiences of safety problems | ||
| Unadjusted | 88.5 | – |
| Adjusted for patient characteristics | 86.4 | 2.4 |
| Adjusted for patient and practice characteristics | 84.5 | 4.5 |
| Harm | ||
| Unadjusted | 246.2 | – |
| Adjusted for patient characteristics | 225.1 | 8.6 |
| Adjusted for patient and practice characteristics | 225.1 | 8.6 |
| Overall perception of patient safety | ||
| Unadjusted | 273.2 | – |
| Adjusted for patient characteristics | 273.2 | 0.0 |
| Adjusted for patient and practice characteristics | 261.2 | 4.4 |