Table 1 Cohort characteristics
Characteristic | Knee N = 610 | Hip N = 692 | ||||
|---|---|---|---|---|---|---|
Public N = 240 (%) | Private N = 370 (%) | P-value | Public N = 248 (%) | Private N = 444 (%) | P-value | |
Age mean (SD) | 69.1 (8.6) | 68.4 (8.4) | 0.30 | 65.6 (10.5) | 65.4 (10.4) | 0.85 |
Female | 106 (44.2) | 159 (43) | 0.77 | 129 (52) | 203 (45.7) | 0.11 |
Body mass index, mean (SD) | 32.2 (6) | 30.7 (5.7) | 0.002 | 30.7 (6.6) | 28.2 (4.9) | <.001 |
Body mass index category | ||||||
 Underweight (< 18.5) | 0 | 0 | 0.015 | 3 (1.2) | 1 (0.2) | < 0.001 |
 Normal (18.5–24.9) | 21 (8.8) | 47 (12.7) | 46 (18.5) | 116 (26.1) | ||
 Obesity Class 1 (30–34.9) | 68 (28.3) | 118 (31.9) | 58 (23.4) | 94 (21.2) | ||
 Obesity Class 2 (35–39.9) | 51 (21.3) | 45 (12.2) | 36 (14.5) | 26 (5.9) | ||
 Extreme Obesity Class 3 (≥40) | 21 (8.8) | 23 (6.2) | 24 (9.7) | 13 (2.9) | ||
ASAa score | ||||||
 1 | 18 (7.5) | 39 (10.5) | 0.12 | 21 (8.5) | 72 (16.2) | 0.004 |
 2 | 129 (53.8) | 187 (50.5) | 150 (60.5) | 276 (62.2) | ||
 3 | 73 (30.4) | 132 (35.7) | 69 (27.8) | 88 (19.8) | ||
 4 | 5 (2.1) | 2 (0.5) | 1 (0.4) | 7 (1.6) | ||
Stroke | 15 (6.3) | 20 (5.4) | 0.66 | 21 (8.5) | 24 (5.4) | 0.12 |
Hypertension | 183 (76.3) | 231 (62.4) | < 0.001 | 141 (56.9) | 212 (47.7) | 0.022 |
Heart disease | 72 (30) | 113 (30.5) | 0.89 | 47 (19) | 88 (19.8) | 0.78 |
Kidney disease | 13 (5.4) | 11 (3) | 0.13 | 10 (4) | 6 (1.4) | 0.024 |
Liver disease | 6 (2.5) | 13 (3.5) | 0.48 | 8 (3.2) | 6 (1.4) | 0.093 |
Diabetes | 59 (24.6) | 54 (14.6) | 0.002 | 19 (7.7) | 47 (10.6) | 0.21 |
Neurological disease | 8 (3.3) | 8 (2.2) | 0.38 | 5 (2) | 10 (2.3) | 0.84 |
Respiratory disease | 54 (22.5) | 58 (15.7) | 0.033 | 59 (23.8) | 55 (12.4) | < 0.001 |
Current cancer | 7 (2.9) | 10 (2.7) | 0.88 | 9 (3.6) | 3 (0.7) | 0.004 |
Diagnosed mental health condition | 55 (22.9) | 50 (13.5) | 0.003 | 42 (16.9) | 48 (10.8) | 0.022 |
Sleep apnoea | 21 (8.8) | 31 (8.4) | 0.87 | 21 (8.5) | 13 (2.9) | 0.001 |
Previous knee or hip arthroplasty | 69 (28.8) | 113 (30.5) | 0.64 | 65 (26.2) | 129 (29.1) | 0.42 |
Other low back pain/lower limb painc | 113 (47.1) | 172 (46.5) | 0.89 | 140 (56.5) | 211 (47.5) | 0.024 |
Oxford Hip Score, mean (SD) | n/a | n/a |  | 17 (7.9) | 23.6 (8.9) | < 0.001 |
Oxford Knee Score, mean (SD) | 21 (7.8) | 24.1 (8.1) | <.001 | n/a | n/a | Â |
EuroQol today score, median (IQR) | 75 (60, 85) | 75 (65, 85) | 0.76 | 75 (50, 85) | 75 (60, 85) | 0.062 |
LOSb (days) median (IQR) | 4 (4, 6) | 6 (5, 7) | <.001 | 4 (3, 6) | 5 (4, 6) | < 0.001 |