Association between type of anesthesia and length of hospital stay in primary unilateral total knee arthroplasty patients: a single-center retrospective study

Table 2 Univariate analysis for LOS

Covariate	β (95%CI)	P value
Patient demographics
Race
Chinese	Reference
Malay	− 0.44 (− 1.19, 0.31)	0.248
Indian	0.12 (− 0.68, 0.92)	0.766
Others	0.51 (− 0.61, 1.63)	0.368
Gender
Female	Reference
Male	− 0.1 (− 0.54, 0.34)	0.669
Age(years)
< 65	Reference
≥ 65	0.77 (0.39, 1.15)	< 0.001
BMI (kg/m²)
< 25	Reference
25–29.9	− 0.29 (− 0.74, 0.16)	0.205
≥ 30	0.26 (− 0.76, 0.23)	0.299
Details of operation
Type of Anaesthesia
GA	0.84 (0.44, 1.23)	< 0.001
RA	Reference
Operation duration (mins)
< 60	Reference
60–90	0.16 (− 0.42, 0.73)	0.594
≥ 90	0.66 (0.05, 1.28)	0.033
Day of week of operation
Monday	1.26 (0.66,1.87)	< 0.001
Tuesday	1.00 (0.44, 1.56)	< 0.001
Wednesday	0.74 (0.14, 1.34)	0.016
Thursday	Reference
Friday	1.5 (0.88, 2.11)	< 0.001
Saturday	0.11 (− 0.81, 1.02)	0.82
Perioperative blood transfusion
No	Reference
Yes	6.81 (5.96, 7.65)	< 0.001
Patient comorbidities
ASA status
I	Reference
II	0.37 (− 0.38, 1.12)	0.339
III	2.95 (1.9, 4)	< 0.001
Preoperative Hb (g/dL)
< 11	1.28 (0.51, 2.05)	0.001
11–12.9	0.63(0.24, 1.03)	0.002
≥ 13	Reference
Smoking
No	Reference
Yes	− 0.37 (− 1.02, 0.27)	0.253
OSA
No	Reference
Yes	− 0.51 (− 1.16, 0.15)	0.129
DM
No	Reference
Yes	1.03 (0.55, 1.51)	< 0.001
IHD
No	Reference
Yes	1.37 (0.54, 2.2)	0.001
CCF
No	Reference
Yes	6.5 (4.30, 8.69)	< 0.001
CVA
No	Reference
Yes	1.04 (− 0.36, 2.44)	0.144
Creatinine > 2 mg/dL
No	Reference
Yes	6.86 (4.67, 9.06)	< 0.001
NA	0.09 (− 0.51, 0.69)	0.770

GA general anesthesia, RA regional anesthesia, BMI body mass index, ASA Status American Society of Anesthesiologist Physical Status, Hb haemoglobin, LOS length of stay, OSA Obstructive sleep apnea, DM diabetes mellitus, IHD ischemic heart disease, CCF congestive cardiac failure, CVA cerebrovascular accidents, SD standard deviation, NA not recorded

ISSN: 1749-799X