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Table 1 Baseline Characteristics of participants underwent unilateral TKA (N = 2366)

From: Two types of anaesthesia and length of hospital stay in patients undergoing unilateral total knee arthroplasty (TKA): a secondary analysis based on a single-centre retrospective cohort study in Singapore

Anaesthesia Total RA GA P-value
N 2366 1560 806  
Age (years),Mean ± SD 66.57 ± 8.23 67.46 ± 8.01 64.86 ± 8.39 < 0.001
BMI,Mean ± SD 27.68 ± 5.70 27.58 ± 6.16 27.87 ± 4.68 0.247
Hb(g/dL),Mean ± SD 13.08 ± 1.45 13.07 ± 1.42 13.09 ± 1.52 0.747
LOS,Mean (SD) Median (Q1-Q3) 5.37 (4.87) 4.00 (3.00–6.00) 5.09 (3.98) 4.00 (3.00–5.00) 5.92 (6.20) 4.00 (4.00–6.00) < 0.001
Duration of surgery (mins), Mean ± SD 80.52 ± 22.81 79.93 ± 22.19 81.67 ± 23.95 0.079
Sex, n (%)     0.003
 Female 1794 (75.82%) 1154 (73.97%) 640 (79.40%)  
 Male 572 (24.18%) 406 (26.03%) 166 (20.60%)  
Ethnicity, n (%)     0.019
 Chinese 1987 (83.98%) 1334 (85.51%) 653 (81.02%)  
 Malay 169 (7.14%) 103 (6.60%) 66 (8.19%)  
 Indian 137 (5.79%) 76 (4.87%) 61 (7.57%)  
 Others 73 (3.09%) 47 (3.01%) 26 (3.23%)  
ASA Status     0.007
 1 161 (6.80%) 91 (5.83%) 70 (8.68%)  
 2 2058 (86.98%) 1381 (88.53%) 677 (84.00%)  
 3 147 (6.21%) 88 (5.64%) 59 (7.32%)  
Smoking, n (%) 225 (9.51%) 161 (10.32%) 64 (7.94%) 0.061
OSA, n (%) 214 (9.04%) 144 (9.23%) 70 (8.68%) 0.661
DM, n (%) 446 (18.85%) 293 (18.78%) 153 (18.98%) 0.906
IHD, n (%) 127 (5.37%) 83 (5.32%) 44 (5.46%) 0.887
CCF, n (%) 18 (0.76%) 16 (1.03%) 2 (0.25%) 0.039
CVA, n (%) 45 (1.90%) 29 (1.86%) 16 (1.99%) 0.831
Creatinine > 2 mg/dl, n (%) 18 (0.76%) 11 (0.71%) 7 (0.87%) 0.657
DM on insulin, n (%) 39 (1.65%) 25 (1.60%) 14 (1.74%) 0.907
Day of week of operation, n (%)     0.153
 Monday 390 (16.48%) 244 (15.64%) 146 (18.11%)  
 Tuesday 539 (22.78%) 354 (22.69%) 185 (22.95%)  
 Wednesday 405 (17.12%) 276 (17.69%) 129 (16.00%)  
 Thursday 533 (22.53%) 368 (23.59%) 165 (20.47%)  
 Friday 378 (15.98%) 247 (15.83%) 131 (16.25%)  
 Saturday 121 (5.11%) 71 (4.55%) 50 (6.20%)  
  1. Abbreviations: GA General anaesthesia, RA Regional anaesthesia, LOS Length of stay, ASA American Society of Anesthesiologist Physical Status, OSA Obstructive sleep apnea, DM Diabetes mellitus, IHD Ischaemic heart disease, CCF Congestive cardiac failure, CVA Cerebrovascular accidents, TKA Total knee arthroplasty