Table 1.
Baseline patient demographics and characteristics.
| Variable | Overall (N = 2177) |
Responder (N = 1983) | Non-Responder (N = 194) | p-Value |
|---|---|---|---|---|
| Sex [N (%)] | 0.825 | |||
| Female | 1218 (55.9) | 1108 (91.0) | 110 (9.0) | |
| Male | 959 (44.1) | 875 (91.2) | 84 (8.8) | |
| Age [mean (SD)] | 66.5 (11.7) | 66.3 (11.7) | 68.0 (11.6) | 0.051 |
| $ BMI [mean (SD)] | 30.5 (6.2) | 30.4 (6.1) | 31.3 (6.5) | |
| Obesity Class [N (%)] | <0.043 | |||
| BMI < 30 kg/m2 | 1116 (51.3) | 1026 (91.9) | 90 (8.1) | |
| 30 ≤ BMI < 35 kg/m2 | 612 (28.1) | 560 (91.5) | 52 (8.5) | |
| 35 ≤ BMI < 40 kg/m2 | 286 (13.1) | 258 (90.2) | 28 (9.8) | |
| BMI ≥ 40 kg/m2 | 163 (7.5) | 139 (72.9) | 24 (14.7) | |
| & ASA Score [N (%)] | 0.013 | |||
| ≤2 | 1283 (58.9) | 1185 (92.4) | 98 (7.6) | |
| ≥3 | 894 (41.1) | 798 (89.3) | 96 (10.7) | |
| Charlson Comorbidity [N (%)] | ||||
| 0 | 1273 (58.8) | 1187 (93.2) | 86 (6.8) | <0.001 |
| 1 | 521 (23.9) | 469 (90.0) | 12 (10.0) | |
| ≥2 | 383 (17.6) | 327 (85.4) | 56 (14.6) | |
| Smoker [N (%)] | 0.307 | |||
| Current | 309 (14.2) | 275 (89.0) | 34 (11.0) | |
| Ex | 616 (28.3) | 567 (92.0) | 49 (8.0) | |
| Never | 1252 (57.5) | 1141 (91.1) | 111 (8.9) | |
| + K-L Grade [N (%)] | <0.001 | |||
| ≤3 | 616 (28.3) | 534 (86.7) | 82 (13.3) | |
| 4 | 1561 (71.7) | 1449 (92.8) | 112 (7.2) | |
| Aetiology [N (%)] | 0.328 | |||
| Osteoarthritis | 1869 (85.9) | 1711 (91.5) | 158 (8.5) | |
| Inflammatory Arthritis | 91 (4.2) | 80 (87.9) | 11 (12.1) | |
| Avascular Necrosis | 146 (6.7) | 129 (88.4) | 17 (11.6) | |
| Dysplasia | 71 (3.3) | 63 (88.7) | 8 (11.3) | |
| Pre ^ WOMAC-Pain [mean (SD)] | 65.6 (18.2) | 66.0 (18.0) | 61.6 (19.7) | 0.001 |
| Pre WOMAC-Motion [mean (SD)] | 70.0 (20.4) | 70.3 (20.3) | 66.9 (20.8) | 0.028 |
| Pre WOMAC-Function [mean (SD)] | 68.2 (17.5) | 68.6 (17.4) | 64.6 (17.7) | 0.002 |
| Pre WOMAC-Global [mean (SD)] | 67.8 (16.7) | 68.2 (17.2) | 64.1 (17.2) | 0.001 |
| Pre-surgery VR12 * MCS [mean (SD)] | 41.1 (14.9) | 41.2 (15.0) | 39.9 (14.1) | 0.226 |
| Pre-surgery VR12 # PCS [mean (SD)] | 24.3 (7.4) | 24.4 (7.4) | 23.9 (6.9) | 0.387 |
| Interpreter Required | 0.025 | |||
| Yes | 178 (8.2) | 170 (87.6) | 24 (12.4) | |
| No | 1999 (91.8) | 1829 (91.6) | 154 (8.4) | |
| Socio-Economic Index | 0.011 | |||
| ≤5 | 913 (41.9) | 815 (89.3) | 98 (10.7) | |
| ≥6 | 1264 (58.1) | 1168 (92.8) | 96 (7.2) | |
| Rurality [N (%)] | 0.428 | |||
| Metropolitan | 1731 (79.5) | 1581 (91.3) | 150 (8.7) | |
| Regional | 446 (20.5) | 402 (90.1) | 44 (9.9) |
$ BMI = body mass index; & ASA = American Society of Anaesthesiologists; + K-L = Kellgren–Lawrence; ^ WOMAC = Western Ontario and McMaster Universities Arthritis Index; * MCS = Mental Component Scale; # PCS = Physical Component Scale.