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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