Table 3 Patient characteristics according to ‘low’ SES score ≤ 5 (SES Low ) or ‘high’ SES score ≥ 6 (SES High )
From: Outcomes following large joint arthroplasty: does socio-economic status matter?
| Â | Knee replacements (n = 1,016) | Hip replacements (n = 835) | ||||
|---|---|---|---|---|---|---|
| Â | SESLow(n = 335) | SESHigh(n = 681) | p | SESLow(n = 263) | SESHigh(n = 572) | p |
Mean ± SD or n (%) | Mean ± SD or n (%) | Mean ± SD or n (%) | Mean ± SD or n (%) | |||
Sex: | Â | Â | Â | Â | Â | Â |
  Female | 236 (70.5%) | 452 (66.4%) | 0.19 | 147 (55.9%) | 355 (62.1%) | 0.09 |
  Male | 99 (29.6%) | 229 (33.6%) | 116 (44.1%) | 217 (37.9%) | ||
Age (years) | 69.1 ± 8.6 | 70.9 ± 8.5 | 0.002 | 67.8 ± 10.2 | 68.7 ± 9.8 | 0.19 |
BMI (kg/m2)¶ | 33.0 ± 5.7 | 32.1 ± 6.0 | 0.02 | 30.2 ± 5.1 | 29.7 ± 5.9 | 0.44 |
Obesity¥ | 231 (69.0%) | 410 (60.2%) | 0.007 | 126 (47.9%) | 245 (42.8%) | 0.17 |
Aetiology: | Â | Â | Â | Â | Â | 0.09 |
  OA | 312 (93.1%) | 645 (94.7%) | 0.5 | 222 (84.4%) | 504 (88.1%) | |
  RA | 22 (6.6%) | 33 (4.9%) | 17 (6.5%) | 16 (2.8%) | ||
  AVN | 1 (0.3%) | 3 (0.4) | 16 (6.1%) | 34 (5.9%) | ||
  CHD | - | - | 8 (3.0%) | 18 (3.2%) | ||
Contralateral joint replacementâ–¡ | 102 (30.5%) | 223 (32.8%) | 0.46 | 64 (24.3%) | 140 (24.5%) | 0.97 |
Prosthesis type: | Â | Â | 0.12 | - | - | - |
  Cruciate retaining | 123 (36.7%) | 277 (40.7%) | ||||
  Posterior stabilizing | 195 (58.2%) | 385 (56.5%) | ||||
  Ultra congruent | 17 (5.1%) | 19 (2.8%) | ||||
Patella resurfaced | 108 (32.2%) | 207 (30.4%) | 0.55 | - | - | - |
Cementation: | Â | Â | Â | Â | Â | 0.82 |
  Uncemented | - | - | - | 48 (18.3%) | 100 (17.5%) | |
  Hybrid | 191 (72.6%) | 426 (74.5%) | ||||
  Totally cemented | 24 (.1%) | 46 (8.0%) | ||||
Age-adjusted CCI* | 1.7 ± 2.1 | 1.8 ± 2.2 | 0.55 | 1.6 ± 2.1 | 1.5 ± 2.1 | 0.70 |
Complication | 64 (19.1%) | 158 (23.2%) | 0.14 | 67 (25.5%) | 155 (27.1%) | 0.62 |
Non-English speaking | 52 (15.5%) | 102 (15.0%) | 0.82 | 29 (11.0%) | 55 (9.7%) | 0.54 |
Pre-op IKSSPain ∞ | 5.7 ± 8.5 | 5.2 ± 8.1 | 0.35 | - | - | - |
Post-op IKSSPain ∞ | 35.0 ± 15.3 | 35.3 ± 15.3 |  | - | - | - |
Change in IKSSPain ∞ | 29.2 ± 16.9 | 30.1 ± 16.1 | 0.44 | - | - | - |
Pre-op IKSSFunction ** | 36.7 ± 19.5 | 35.9 ± 19.6 | 0.57 | - | - | - |
Post-op IKSSFunction ** | 58.0 ± 24.9 | 58.7 ± 26.3 | 0.65 | - | - | - |
Change in IKSSFunction ** | 21.3 ± 23.1 | 22.8 ± 24.8 | 0.35 | - | - | - |
Pre-op PCS§ | 27.9 ± 6.8 | 26.8 ± 6.0 | 0.008 | 26.9 ± 6.1 | 25.9 ± 5.2 | 0.012 |
Post-op PCS§ | 37.8 ± 11.0 | 37.7 ± 10.6 | 0.88 | 39.7 ± 11.2 | 40.1 ± 11.0 | 0.58 |
Change in PCS§ | 10.0 ± 11.3 | 10.0 ± 10.6 | 0.17 | 12.8 ± 11.7 | 14.3 ± 11.3 | 0.08 |
Pre-op MCS¶ | 47.2 ± 12.0 | 49.4 ± 11.6 | 0.005 | 45.6 ± 12.5 | 47.0 ± 11.8 | 0.11 |
Post-op MCS¶ | 50.9 ± 11.0 | 50.9 ± 10.9 | 0.99 | 51.5 ± 10.7 | 51.0 ± 10.8 | 0.54 |
Change in MCS¶ | 3.8 ± 12.9 | 1.5 ± 12.2 | 0.008 | 5.9 ± 13.3 | 4.0 ± 12.7 | 0.047 |
Pre-op HHSPain # | - | - | - | 11.9 ± 4.6 | 12.1 ± 4.6 | 0.72 |
Post-op HHSPain # | - | - | - | 38.2 ± 9.6 | 38.8 ± 8.7 | 0.34 |
Change in HHSPain # | - | - | - | 26.2 ± 10.3 | 26.7 ± 9.5 | 0.47 |
Pre-op HHSFunction ¢ | - | - | - | 17.1 ± 9.7 | 17.0 ± 8.8 | 0.93 |
Post-op HHSFunction ¢ | - | - | - | 34.3 ± 10.3 | 34.2 ± 10.9 | 0.89 |
Change in HHSFunction ¢ | - | - | - | 17.2 ± 11.3 | 17.1 ± 10.8 | 0.94 |