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Table 3 Multivariate analyses of risk factors associated with LOS

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

 

Model I

Model II

Model III

β (95%CI)

P value

β (95%CI)

P value

β (95%CI)

P value

Age (years)

 Per 10

0.68 (0.45–0.91)

< 0.001

0.69 (0.46–0.93)

< 0.001

0.5 (0.27–0.73)

< 0.001

  < 65

Reference

 

Reference

 

Reference

 

  ≥ 65

0.77 (0.39–1.15)

 < 0.001

0.77 (0.38–1.16)

 < 0.001

0.48 (0.09–0.87)

0.015

Hb (g/dL)

  < 11

Reference

 

Reference

 

Reference

 

 11–12.9

− 0.65 (− 1.43 to 0.14)

0.109

− 0.62 (− 1.4 to 0.17)

0.124

0.34 (− 0.41 to 1.08)

0.374

  ≥ 13

-1.28 (-2.05 to − 0.51)

0.001

− 1.12 (− 1.89 to − 0.35)

0.004

0.13 (− 0.6 to 0.87)

0.721

DM

 No

Reference

 

Reference

 

Reference

 

 Yes

1.03 (0.55–1.51)

 < 0.001

0.97 (0.49–1.45)

 < 0.001

0.8 (0.33–1.27)

0.001

CCF

 No

Reference

 

Reference

 

Reference

 

 Yes

6.5 (4.3–8.69)

 < 0.001

6.28 (4.1–8.47)

 < 0.001

4.1 (2.02–6.17)

< 0.001

IHD

      

 No

      

 Yes

      

Operation duration (mins)

  < 60

Reference

 

Reference

 

Reference

 

 60–90

0.16 (− 0.42 to 0.73)

0.594

0.19 (− 0.38 to 0.77)

0.513

0.17 (− 0.37 to 0.7)

0.544

  ≥ 90

0.66 (0.05–1.28)

0.033

0.72 (0.11–1.32)

0.021

0.49 (− 0.09 to 1.07)

0.095

Perioperative blood transfusion

 No

Reference

 

Reference

 

Reference

 

 Yes

6.81 (5.96–7.65)

 < 0.001

6.62 (5.77–7.47)

 < 0.001

5.71 (4.86–6.56)

< 0.001

Creatinine > 2 mg/dL

 No

Reference

 

Reference

 

Reference

 

 Yes

6.86 (4.67–9.05)

 < 0.001

6.89 (4.7–9.07)

 < 0.001

4.54 (2.46–6.62)

< 0.001

 NA

0.09 (− 0.51 to 0.69)

0.77

0.11 (− 0.49 to 0.71)

0.722

0.09 (− 0.47 to 0.66)

0.744

ASA status

 I

Reference

 

Reference

 

Reference

 

 II

0.37 (-0.38–1.12)

0.339

0.2 (− 0.55 to 0.95)

0.596

0.15 (− 0.56 to 0.85)

0.684

 III

2.95 (1.9–4)

< 0.001

2.68 (1.62–3.73)

 < 0.001

1.72 (0.72–2.71)

0.001

Type of anesthesia

 GA

0.84 (0.44–1.23)

< 0.001

1.03 (0.63–1.43)

 < 0.001

0.78 (0.41–1.66)

 < 0.001

 RA

Reference

 

Reference

 

Reference

 
  1. Data presented are β and 95% CIs
  2. Model I: We did not adjust any covariants
  3. Model II: We adjusted age, gender and race
  4. Model III: 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
  5. GA general anesthesia, RA regional anesthesia, ASA Status American Society of Anesthesiologist Physical Status, Hb hemoglobin, DM diabetes mellitus, IHD ischemic heart disease, CCF congestive cardiac failure
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X