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

Table 4 Effect size of type of anesthesia on LOS in each group

Subgroup	N	β (95% CI)	P value	P for interaction
Age(years)				0.006
< 65	940	− 0.27 (− 0.73 to 0.19)	0.247
≥ 65	1369	− 1.12 (− 1.66 to − 0.58)	< 0.001
Gender				0.063
Female	1746	− 0.68 (− 1.08 to − 0.29)	0.001
Male	563	− 1.31 (− 2.30 to − 0.31)	0.010
Preoperative Hb (g/dL)				0.934
< 11	156	− 1.49 (− 2.68 to − 0.3)	0.015
11–12.9	868	− 0.78 (− 1.49 to − 0.07)	0.032
≥ 13	1286	− 0.79 (− 1.25 to − 0.34)	0.001
BMI (kg/m²)				0.01
< 25	683	− 1.92 (− 2.73 to − 1.11)	< 0.001
25–29.9	986	− 0.31(− 0.92 to 0.29)	0.313
≥ 30	640	− 0.58(− 1.1 to − 0.06)	0.029
ASA status				0.526
I	155	− 0.03 (− 0.79 to 0.73)	0.934
II	2016	− 0.85 (− 1.23 to − 0.48)	< 0.001
III	138	− 1.12(− 4.65 to 2.41)	0.536
Operation duration (mins)				0.817
< 60	308	− 1.1 (− 1.81 to − 0.39)	0.003
60–89	1231	− 0.82 (− 1.38 to − 0.26)	0.004
≥ 90	773	− 0.72 (− 1.37 to − 0.08)	0.028
DM				0.061
No	1869	− 0.64 (− 1.02 to − 0.26)	0.001
Yes	440	− 1.6 (− 2.69 to − 0.51)	0.004

We adjusted age, gender, race, ASA status, Hb, smoking, Operation Duration, BMI, DM, creatinine > 2 mg/dL, IHD, CCF, CVA, Type of anesthesia, Day of week of operation and the perioperative blood transfusion. In each case, the model is not adjusted for the variable itself
BMI body mass index, ASA Status American Society of Anesthesiologist Physical Status, Hb haemoglobin, DM diabetes mellitus

ISSN: 1749-799X