Table A4.
Descriptive statistics – emergency sample.
| Variable | Obs | Mean | SD | ICC |
|---|---|---|---|---|
| Patient characteristics | ||||
| Distance travelled (in km) | 73,496 | 14.2 | 27.1 | |
| Distance travelled past closest provider (in km) | 73,496 | 4.2 | 25.3 | |
| Number of providers within 10 km radius | 73,496 | 1.0 | 1.2 | |
| Number of providers within 30 km radius | 73,496 | 5.0 | 4.7 | |
| Age | 73,496 | 80.9 | 9.8 | |
| Male | 73,496 | 0.3 | 0.4 | |
| Past utilisation | 73,496 | 0.7 | 1.2 | |
| Number of Elixhauser conditions | 73,496 | 1.0 | 1.6 | |
| Income deprivation | 73,496 | 0.1 | 0.1 | |
| Provider characteristics | ||||
| Observed volume | 393 | 187.2 | 87.0 | 80.7% |
| Waiting time (proportion waiting > 120 days) | 393 | 0.2 | 0.1 | 43.7% |
| Change in Oxford Hip Score | 393 | 19.4 | 1.3 | 47.9% |
| 28-day emergency readmission rate (%) | 393 | 5.97 | 2.22 | 37.0% |
| 1-year revision rate (%) | 393 | 0.95 | 0.72 | 22.4% |
| 28-day mortality rate (%) | 393 | 0.20 | 0.25 | 4.5% |
Obs = Observations; SD = Standard deviation; ICC = Intraclass correlation coefficient.
Notes: Patient characteristics for emergency patients treated between April 2010 and March 2013. Waiting time and quality metrics are for financial years 2009/10 to 2011/12. Provider characteristics are unweighted. The intraclass correlation coefficient (ICC) measures the proportion of variation that occurs between providers, rather than over time.