Table 4.
Before and after propensity score matching results by patient variable for fiscal year 2010–20111
| Covariate variable | Before matching | After matching | Reduction in bias (%) | ||||
|---|---|---|---|---|---|---|---|
| Mean of incentive group | Mean of nonincentive group | Standardized percentage of bias | Mean of incentive group | Mean of nonincentive group | Standardized percentage of bias | ||
| Diabetes-only patients | |||||||
| Number | 78,513 | 60,535 | 60,535 | 60,535 | |||
| Age group | 2.988 | 2.800 | 16.6 | 2.707 | 2.800 | −8.2 | 50.7 |
| Sex | 0.489 | 0.537 | −9.5 | 0.577 | 0.537 | 8.0 | 15.8 |
| RUB level | 3.238 | 3.279 | −7.5 | 3.277 | 3.279 | −0.3 | 95.7 |
| Attachment level | 4.094 | 3.807 | 24.6 | 3.853 | 3.807 | 3.9 | 84.0 |
| Hypertension-only patients | |||||||
| Number | 154,896 | 169,484 | 154,896 | 169,484 | |||
| Age group | 3.195 | 2.939 | 21.7 | 3.195 | 3.054 | 12.0 | 44.9 |
| Sex | 0.581 | 0.584 | −0.6 | 0.581 | 0.573 | 1.6 | −160.7 |
| RUB level | 3.257 | 3.320 | −10.9 | 3.257 | 3.285 | −4.9 | 54.8 |
| Attachment level | 4.028 | 3.723 | 26.0 | 4.028 | 3.879 | 12.7 | 51.0 |
1
British Columbia Ministry of Health Services, Primary Care Data Repository, Fiscal Year 2010–2011.
RUB = Resource Utilization Band.