Measures of quality
| Quality dimensions | Characteristic | Pre-WCIS | Post-WCIS | P value | |||
| Hip | Knee | Hip | Knee | Hip | Knee | ||
| Accessibility (also see table 2) | Total waiting time (weeks) (SD) | 43.0 (31.3) (77.4% data missing) | 56.0 (46.4) (67.6% data missing) | 41.8 (21.5) (13.4% data missing) | 45.4 (26.8) (18.4% data missing) | 0.288* | <0.0014* |
| Waiting time 2 (SD) | 31.1 (25.9) (18.3% data missing) | 37.9 (32.3) (0.3% data missing) | 28.1 (19.5) (0.2% data missing) | 31.4 (22.7) (0.5% data missing) | 0.332* | <0.0001* | |
| Meeting benchmark (%) | 53.0 (0.1% hip data missing) | 43.2 (0.004% knee data missing) | 53.7 (0.1% hip data missing) | 49.1 (0.004% knee data missing) | 0.765† | 0.0024† | |
| Acceptability | Satisfaction 1 year postsurgery (%) (yes/no) | 93.9 (57% hip data missing) | 87.2 (52% knee data missing) | 95.1 (57% hip data missing) | 87.3 (52% knee data missing) | 0.499† | 0.978† |
| Appropriateness | See table 2 | ||||||
| Effectiveness | Change in mean Oxford score (SD) (range: 12–60) (postsurgery minus presurgery) | 24.6 (10.6) (65% data missing) | 17.5 (10.2) (65% data missing) | 25.5 (10.8) (65% data missing) | 18.4 (10.3) (65% data missing) | 0.283* | 0.185* |
| Safety | Reporting complication at 1 year postsurgery (%) | 8.6 | 7.8 | 1.9 | 2.2 | <0.001† | <0.001† |
| Safety | In-hospital mortality (%) | 0 (47% hip data missing) | 0 (49% knee data missing) | 0 (47% hip data missing) | 0 (49% knee data missing) | ||
Missing data reported where missing; where not reported, data were not missing.
Waiting time data were log-transformed to ensure normal distribution for statistical analysis.
Benchmark: proportion of patients receiving surgery within 26-week clinically recommended benchmark (0=did not meet, 1=did meet).
Satisfaction: self-reported patient satisfaction with surgery (postsurgery questionnaire).
Oxford hip and knee scores: range 12 (best) to 60 (worst).
Complication: self-reported patient complications following surgery (postsurgery questionnaire): dislocation of joint requiring treatment in hospital; blood clot in the calf (deep vein thrombosis, ‘DVT’) requiring treatment; blood clot in the lungs requiring treatment; infection of replaced joint requiring oral or intravenous antibiotics; infection of replaced joint requiring further surgery; further surgery for problems with joint replacement.
Bold values indicate p<0.05.
*P value calculated using Student’s t-test.
†P value calculated using χ2 test.
WCIS, Winnipeg Central Intake Service.