Table 1 Patient characteristics (categorical variables)
From: Outcomes following large joint arthroplasty: does socio-economic status matter?
| Â | Knee replacements n (%) | Hip replacements n (%) |
|---|---|---|
Total number of patients | 1016 (100%) | 835 (100%) |
Sex: | Â | Â |
  Female | 688 (67.7%) | 502 (60.1%) |
  Male | 328 (32.3%) | 333 (39.9%) |
Obesity¶ | 641 (63.1%) | 371 (44.4%) |
Aetiology: | Â | Â |
  OA | 957 (94.2%) | 726 (87.0%) |
  RA | 55 (5.4%) | 33 (4.0%) |
  AVN | 4 (0.4%) | 50 (6.0%) |
  CHD | - | 26 (3.1%) |
Contralateral joint replacement | 325 (32.0%) | 204 (24.4%) |
Prosthesis type:§ |  | - |
  Cruciate retaining | 400 (39.4%) | |
  Posterior stabilising | 580 (57.1%) | |
  Ultra congruent | 36 (3.5%) | |
Patella resurfaced§ | 315 (31.0%) | - |
Cementation:∞ | - |  |
  Uncemented | 148 (17.7%) | |
  Hybrid | 617 (73.9%) | |
  Totally cemented | 70 (8.4%) | |
Diabetes | 196 (19.3%) | 104 (12.5%) |
Hypertension | 639 (62.9%) | 440 (52.7%) |
AMI/IHD/CCF | 116 (11.4%) | 89 (10.7%) |
Asthma/COAD | 167 (16.4%) | 119 (14.3%) |
Cancer | 69 (6.8%) | 58 (7.0%) |
Smoker: | Â | Â |
  Ex- | 235 (23.1%) | 236 (28.3%) |
  Current | 60 (5.9%) | 91 (10.9%) |
Complication | 222 (21.9%) | 222 (26.6%) |
Non-English speakingâ–¡ | 154 (15.2%) | 84 (10.1%) |
Pre-op physical impairment:** | Â | Â |
  None | 6 (0.6%) | 2 (0.2%) |
  Mild | 45 (4.4%) | 20 (2.4%) |
  Moderate | 208 (20.5%) | 140 (16.8%) |
  Severe | 757 (74.5%) | 673 (80.6%) |
Post-op physical impairment:** | Â | Â |
  None | 170 (16.7%) | 192 (23.0%) |
  Mild | 248 (24.4%) | 219 (26.2%) |
  Moderate | 306 (30.1%) | 237 (28.4%) |
  Severe | 292 (28.7%) | 187 (22.4%) |
Pre-op mental distress:*** | Â | Â |
  None | 525 (51.7%) | 359 (43.0%) |
  Mild | 203 (20.0%) | 197 (23.6%) |
  Moderate | 228 (22.4%) | 201 (24.1%) |
  Severe | 60 (5.9%) | 78 (9.3%) |
Post-op mental distress:*** | Â | Â |
  None | 593 (58.4%) | 516 (61.8%) |
  Mild | 222 (21.9%) | 168 (20.1%) |
  Moderate | 162 (15.9%) | 109 (13.1%) |
  Severe | 39 (3.8%) | 42 (5.0%) |