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Table 2 Univariate analysis for LOS (Days)

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

  Statistics LOS (Days) β(95%CI) P-value
Age (years) group
  < 60 472 (19.95%) Reference
  > =60, < 70 1011 (42.73%) 0.30 (− 0.22, 0.83) 0.2604
  > =70, < 80 744 (31.45%) 1.14 (0.58, 1.70) < 0.0001
  > =80 139 (5.87%) 2.43 (1.52, 3.35) < 0.0001
Sex
 Female 1794 (75.82%) Reference
 Male 572 (24.18%) −0.14 (− 0.60, 0.32) 0.5539
Ethnicity
 Chinese 1987 (83.98%) Reference
 Malay 169 (7.14%) −0.48 (−1.24, 0.28) 0.2185
 Indian 137 (5.79%) 0.00 (− 0.84, 0.84) 0.9975
 Others 73 (3.09%) 0.63 (−0.51, 1.77) 0.2790
BMI group
  < 25 726 (31.44%) Reference
  > =25, < 30 963 (41.71%) −0.28 (−0.73, 0.16) 0.2159
  > =30, < 35 467 (20.23%) −0.38 (− 0.92, 0.16) 0.1692
  > =35 153 (6.63%) 0.30 (−0.51, 1.11) 0.4650
ASA Status
 1 161 (6.80%) Reference
 2 2058 (86.98%) 0.45 (− 0.32, 1.22) 0.2526
 3 147 (6.21%) 3.98 (2.91, 5.05) < 0.0001
Hb(g/dL) group
  > =13 1314 (55.54%) Reference
  > =11, < 13 888 (37.53%) 0.66 (0.25, 1.07) 0.0018
  < 11 164 (6.93%) 2.09 (1.31, 2.88) < 0.0001
Duration of surgery (mins) group
  < 60 320 (13.52%) Reference
  > =60, < 120 1903 (80.43%) 0.26 (−0.31, 0.84) 0.3678
  > =120 143 (6.04%) 1.74 (0.78, 2.69) 0.0004
Smoking 225 (9.51%) −0.49 (−1.16, 0.18) 0.1525
OSA 214 (9.04%) −0.62 (− 1.30, 0.07) 0.0765
DM 446 (18.85%) 0.94 (0.44, 1.44) 0.0002
IHD 127 (5.37%) 1.71 (0.85, 2.58) 0.0001
CCF 18 (0.76%) 5.90 (3.65, 8.14) < 0.0001
CVA 45 (1.90%) 1.21 (−0.23, 2.64) 0.0993
Creatinine > 2 mg/dl 18 (0.76%) 6.53 (4.28, 8.77) < 0.0001
DM on insulin 39 (1.65%) 0.30 (−1.25, 1.84) 0.7078
Day of week of operation
 Monday 390 (16.48%) Reference
 Tuesday 539 (22.78%) −0.31 (− 0.94, 0.32) 0.3404
 Wednesday 405 (17.12%) −0.62 (−1.30, 0.05) 0.0691
 Thursday 533 (22.53%) −1.29 (− 1.92, − 0.66) < 0.0001
 Friday 378 (15.98%) 0.27 (−0.41, 0.96) 0.4340
 Saturday 121 (5.11%) −1.31 (−2.30, −0.32) 0.0095
  1. Abbreviations: 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