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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