Table 2 Characteristics of the Historical (Before) and Intervention (After) cohorts
|  | Before, n = 279 | After, n = 242 | P-value |
|---|---|---|---|
Age, yr | 67.5 (9.9) | 68.3 (9.4) | 0.31 |
Female, n (%) | 171 (61.3) | 170 (70.2) | 0.03 |
Osteoarthritis, n (%) | 266 (95.3) | 232 (95.9) | 0.77 |
Total knee arthroplasty n (%) | 210 (75.3) | 171 (70.7) | 0.24 |
Unilateral, n (%) | 270 (96.8) | 233 (96.3) | 0.76 |
Time on Wait List, days | 325.2 (97.6) | 332.5 (87.5) | 0.37 |
Body Mass Index | 33.2 (6.8) | 32.6 (6.7) | 0.26 |
Body mass index 30+, n (%) | 185 (66.3) | 151 (62.4) | 0.35 |
American Society of Anesthesiologists Grade 3 or 4, n (%) | 132 (47.5) | 114 (47.7) | 0.96 |
Comorbidity, n (%) | 265 (95.0) | 234 (96.7) | 0.33 |
 Hypertension, n (%) | 192 (68.8) | 164 (67.8) | 0.80 |
 Cardiac, n (%) | 75 (26.9) | 53 (21.9) | 0.19 |
 Diabetes, n (%) | 58 (20.8) | 63 (26) | 0.18 |
 Any central nervous system condition, n (%) | 24 (8.6) | 24 (9.9) | 0.61 |
 Other lower limb or back issues, n (%) | 147 (57.0) | 155 (64.3) | 0.09 |
 Chronic respiratory disease, n (%) | 49 (17.6) | 53 (21.9) | 0.21 |
 Renal impairment, n (%) | 17 (6.1) | 17 (7.0) | 0.67 |
 History of venous thromboembolism, n (%) | 16 (5.7) | 5 (2.1) | 0.03 |
 Documented mental health condition, n (%) | 45 (16.1) | 44 (18.2) | 0.54 |
Interpreter requireda, n (%) | 74 (26.5) | 81 (33.5) | 0.08 |
Country of birth - English speaking, n (%) | 120 (43.0) | 102 (42.1) | 0.84 |
Previous knee or hip arthroplasty, n (%) | 77 (28.5) | 69 (28.6) | 0.98 |
Pre-operative haemoglobin, g/l | 138.8 (13.9) | 137.3 (15.0) | 0.24 |
Oxford Scorec | 18.0 (8.4) | 18.4 (8.1) | 0.63 |
EuroQol Visual analogue score, ‘today’ health,b median (IQR) | 66.5 (30) | 66.0 (29) | 0.90 |
Timed up-and-go pre-surgery, s d | 17.3 (8.5) | 16.9 (9.0) | 0.68 |