Table 1.
Variable | Obs | Mean | SD | ICC |
---|---|---|---|---|
Patient characteristics | ||||
Distance travelled (in km) | 171,472 | 14.6 | 17.4 | |
Distance travelled past closest provider (in km) | 171,472 | 5.0 | 14.4 | |
Number of providers within 10 km radius | 171,472 | 1.3 | 1.5 | |
Number of providers within 30 km radius | 171,472 | 6.7 | 5.7 | |
Age | 171,472 | 68.0 | 11.5 | |
Male | 171,472 | 0.40 | 0.49 | |
Past utilisation | 171,472 | 0.13 | 0.49 | |
Number of Elixhauser conditions | 171,472 | 0.43 | 0.94 | |
Income deprivation | 171,472 | 0.12 | 0.09 | |
Pre-operative Oxford Hip Score | 114,187 | 17.4 | 8.2 | |
Provider characteristics | ||||
Observed volume | 568 | 305.4 | 209.1 | 94.7% |
Waiting time (proportion waiting >120 days) | 568 | 0.2 | 0.2 | 59.5% |
Change in Oxford Hip Score | 568 | 19.8 | 1.4 | 57.2% |
28-day emergency readmission rate (%) | 568 | 5.67 | 2.40 | 36.8% |
1-year revision rate (%) | 568 | 0.94 | 0.82 | 17.8% |
28-day mortality rate (%) | 568 | 0.17 | 0.36 | 3.5% |
Obs = Observations; SD = Standard deviation; ICC = Intraclass correlation coefficient. Notes: Patient characteristics for patients choosing provider 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.