Measure | Control Practices (n=11) | Intervention Practices (n=12) |
---|---|---|
Odds of improvement | ||
OR (95% CI)^{a} | 0.82 (0.59 to 1.15) | 1.21 (0.87 to 1.68) |
OR=1, P value^{b} | .24 | .25 |
Breslow-Day, P value | <.001 | .008 |
Ratio of ORs^{c} | – | 1.47 |
Equal ORs, P value | – | .11 |
Change in performance | ||
Average difference of proportions (95% CI)^{d} | −0.05 (−0.23 to 0.13) | 0.04 (−0.08 to 0.15) |
Change within group, P value | .59 | .48 |
Intervention effect, P value | – | .40 |
CI=confidence interval. 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.