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Table 2 Pre-operative characteristics of joint replacement patients

From: Case-mix & patients' reports of outcome in Independent Sector Treatment Centres: Comparison with NHS providers

Patient characteristic Hip replacement Knee replacement
  NHS (N = 291) ISTC (N = 184) NHS (N = 323) ISTC (N = 187)
  Mean (SD) Mean (SD) Mean (SD) Mean (SD)
Age (years) 66.2 (14.6) 66.8 (14.1) 66.2 (16.5) 66.7 (12.2)
Duration symptoms (years) 3.9 (5.4) 3.7 (3.9) 8.1 (10.1) 8.6 (9.3)
Deprivation score 22.4 (16.8) 20.3 (13.3) 25.2 (17.4) 19.0 (12.6)
EQ-5D score 0.31 (0.31) 0.35 (0.32) 0.36 (0.32) 0.45 (0.30)
Disease-specific score 44.0 (7.7) 42.1 (8.4) 42.3 (7.5) 39.8 (8.0)
  N (%) N (%) N (%) N (%)
Female 157 (54.1) 108 (58.7) 167 (52.0) 96 (51.6)
Any comorbidity 251 (86.2) 148 (80.4) 280 (86.7) 151 (80.7)
Previous similar surgery 79 (27.3) 34 (18.6) 168 (53.3) 78 (42.6)
Poor or fair health 62 (21.5) 27 (14.9) 68 (21.7) 21 (11.5)