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Table 4 Multivariate analysis of factors associated with the length of hospitalization (N = 5831)

From: Factors affecting the length of hospital stay for total knee arthroplasty in Japan: a retrospective study using the diagnosis procedure combination database

Factors

Partial regression coefficient

Standard error

p-value

Intercept

41.92

4.28

< 0.001*

Sex

0.16

0.22

0.476

Age (years)

  

< 0.001*

 < 60

− 0.44

0.62

0.484

 60–64

0.05

0.53

0.930

 65–69

− 1.20

0.41

0.003*

 70–74

− 0.54

0.33

0.100

 75–79

− 0.02

0.30

0.927

 80–84

1.31

0.33

0.001*

 85–89

1.11

0.47

0.017*

 > 90

− 0.24

1.23

0.839

Height

− 0.09

0.02

< 0.001*

Weight

0.03

0.02

0.049*

Body mass index (kg/m2)

  

0.008*

 < 18.5

0.88

0.85

0.300

 18.5–24.9

− 1.42

0.44

0.001*

 25.0–29.9

− 0.63

0.41

0.121

 30.0–40.0

− 1.02

0.48

0.033*

 > 40.0

2.20

1.36

0.106

Barthel index

  

< 0.001*

 < 19

− 6.58

1.84

< 0.001*

 20–39

3.57

1.98

0.071

 40–59

5.62

1.08

< 0.001*

 60–79

− 0.51

0.91

0.572

 ≥ 80

− 2.09

0.71

0.003*

Smoking status

0.33

0.18

0.068

Respirator

− 0.23

0.40

0.552

Anesthesia type

  

< 0.001*

 General anesthesia

− 0.61

0.41

0.139

 Epidural anesthesia

− 2.61

1.19

0.028*

 Spinal anesthesia

1.07

0.57

0.060

 General and epidural anesthesia

0.71

0.43

0.104

 Spinal and epidural anesthesia

1.44

0.91

0.116

Bone transplant

0.52

0.21

0.010*

Postoperative rehabilitation started

0.51

0.05

< 0.001*

Diabetes mellitus

− 0.12

0.16

0.428

Hypertension

0.28

0.15

0.064

Atrial fibrillation

1.21

0.34

< 0.001*

Pneumonia

− 1.06

2.21

0.630

Hyperlipemia

− 0.11

0.19

0.564

Chronic kidney disease

− 0.33

0.41

0.425

Anemia

0.01

0.22

0.991

Cerebrovascular attack

− 0.49

0.35

0.201

Cancer

0.13

0.39

0.728

Pulmonary thromboembolism

− 0.03

0.28

0.909

Rheumatoid arthritis

0.41

0.35

0.252

Osteoporosis

− 0.21

0.22

0.332

Chronic pain

0.52

0.23

0.026*

Annual hospital volume (case/year)

  

< 0.001*

 < 34

6.41

0.52

< 0.001*

 34–71

0.56

0.33

0.082

 71–104

− 1.52

0.28

< 0.001*

 > 104

− 5.46

0.25

< 0.001*

  1. *Significant difference between the groups
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European Journal of Medical Research

ISSN: 2047-783X

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