Sample characteristics
| Control | Active | |||
|---|---|---|---|---|
| Preintervention | Postintervention | Preintervention | Postintervention | |
| Number of operations | 25 | 26 | 25 | 29 |
| Operation length (mean, range) | 1 h 52 min (35 min, 2 h 47 min) | 1 h 44 min (1 h 5 min, 2 h 45 min) | 1 hr 46 min (30 min, 4 h 25 min) | 2 h 7 min (1 h 7 min, 3 h 40 min) |
| Case-mix (number of joint replacements/total operations)* | 21/25 84% (70% to 98%) | 23/26 88% (75% to 100%) | 13/25 52% (32.5% to 71.5%) | 19/29 65% (48% to 82%) |
| Proportion supervised by a consultant* | 19/25 76% (59% to 93%) | 21/26 81% (66% to 96%) | 23/25 92% (81.5% to 100%) | 29/29 100% |
| Mean patient age† (SD) | 63 (15) | 62 (15) | 49 (17) | 50 (20) |
| Male, %† | 48 | 47 | 67 | 61 |
*Data shown are proportions, % and 95% CI of %.
†These figures are calculated from the larger clinical data population.