Patient characteristics
| Characteristic | No. (%) total knee arthroplasty patients* n = 4837 | No. (%) total hip arthroplasty patients* n = 3043 |
|---|---|---|
| Wait time, d, mean ± SD | 396.7 ± 308.5 | 275.8 ± 250.7 |
| Wait time, d, median (IQR) | 312 (410) | 184 (283) |
| BMI, mean ± SD | 32.7 ± 6.8 | 29.1 ± 5.7 |
| BMI, median (IQR) | 31.6 (8.7) | 28.4 (6.8) |
| BMI Category | ||
| <20 | 23 (0.48) | 70 (2.3) |
| 20–24 | 440 (9.1) | 612 (20.1) |
| 25–29 | 1432 (29.6) | 1214 (39.9) |
| 30–34 | 1388 (28.7) | 733 (24.1) |
| 35–39 | 861 (17.8) | 280 (9.2) |
| 40–49 | 595 (12.3) | 122 (4.0) |
| ≥ 50 | 92 (1.9) | 14 (0.46) |
| Age, yr, mean ± SD | 66.1 (9.4) | 64.7 (12.4) |
| Age, yr, median (IQR) | 66.0 (12.0) | 65.0 (17.0) |
| Sex | ||
| Male | 1944 (40.2) | 1397 (45.9) |
| Female | 2893 (59.8) | 1646 (54.1) |
| Median neighbourhood household income, mean ± SD | 64 337 (25 088) | 64 959 (26 069) |
| Median neighbourhood household income, median (IQR) | 61 165 (31 901) | 61 565 (32 255) |
| Year of surgery | ||
| 2011 | 813 (16.8) | 472 (15.5) |
| 2012 | 808 (16.7) | 487 (16.0) |
| 2013 | 822 (17.0) | 542 (17.8) |
| 2014 | 851 (17.6) | 523 (17.2) |
| 2015 | 764 (15.8) | 502 (16.5) |
| 2016 | 784 (16.2) | 517 (17.0) |
| Hospital | ||
| Halifax Infirmary | 3458 (71.5) | 2587 (85.0) |
| Dartmouth | 1379 (28.5) | 456 (15.0) |
| Surgeon | ||
| A | 10.3 | 10.5 |
| B | 5.5 | 6.4 |
| C | 6.0 | 10.4 |
| D | 10.9 | 23.5 |
| E | 11.1 | 11.1 |
| F | 20.2 | 7.2 |
| G | 11.1 | 8.6 |
| H | 12.3 | 14.3 |
| I† | Suppressed | Suppressed |
| J‡ | Suppressed | Suppressed |
BMI = body mass index; IQR = interquartile range; SD = standard deviation.
↵* Unless indicated otherwise.
↵† Surgeon I did not complete any hip replacements over the period therefore results are suppressed for confidentiality.
↵‡ Surgeon J completed few surgeries and therefore results are suppressed for confidentiality.