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Table 2 Characteristics of the Historical (Before) and Intervention (After) cohorts

From: Implementing early mobilisation after knee or hip arthroplasty to reduce length of stay: a quality improvement study with embedded qualitative component

  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
  1. Values are mean (sd), unless otherwise specified. Chi-Square or Fisher’s exact test for proportions
  2. Legend: yr year
  3. aA patient who requires an interpreter for verbal or written communication in a language other than English
  4. bMissing data n = 100
  5. cmissing data = 99
  6. dmissing data n = 161