Patients Screened, Chart Audit Data
| Measure | Control Practices (n=11) | Intervention Practices (n=12) |
|---|---|---|
| Odds of improvement | ||
| OR (95% CI)a | 0.80 (0.58–1.12) | 1.17 (0.86–1.59) |
| OR=1, P valueb | .18 | .32 |
| Breslow-Day, P value | <.001 | .001 |
| Ratio of ORsc | – | 1.45 |
| Equal ORs, P value | – | .10 |
| Change in performance | ||
| Average difference of proportions (95% CI)d | −0.05 (−0.20 to 0.09) | 0.04 (−0.09 to 0.17) |
| Change within group, P value | .44 | .56 |
| Intervention effect, P value | – | .33 |
OR = odds ratio, interpreted as the odds of screening at follow-up relative to the odds of screening at baseline.
↵a P value testing the null hypothesis of no improvement within group.
↵b P value testing whether the odds of improvement are homogeneous across practices within a group.
↵c Calculated as the odds of improvement under the intervention relative to the odds of improvement for the control group.
↵d For each practice, change was measured as the proportion screened at follow-up minus the proportion screened at baseline.