Table 3 Risk factor analysis.

Patient characteristics

Age

0.99

0.97–1.01

0.41

ns

1.01

1.00–1.03

0.07

ns

1.00

0.98 –1.02

0.91

ns

BMI

0.99

0.93 –1.05

0.77

ns

1.02

0.98 –1.05

0.43

ns

1.07

1.02 –1.13

0.004

**

ASA score

0.80

0.47 –1.36

0.41

ns

0.99

0.70 –1.38

0.93

ns

0.94

0.58 –1.52

0.80

ns

KPS postoperative

0.17

0.01 –4.60

0.29

ns

0.03

0.00 –0.81

0.04

*

0.91

0.02 –43.60

0.96

ns

KPS preoperative

1.73

0.02 –161

0.81

ns

21.43

0.45 –1016

0.12

ns

0.11

0.00 –12.20

0.36

ns

mRS postoperative

0.66

0.34 –1.27

0.21

ns

1.39

0.78 –2.48

0.26

ns

1.78

0.83 –3.83

0.14

ns

mRS preoperative

1.90

0.92 –3.93

0.08

ns

0.88

0.48 –1.60

0.67

ns

0.61

0.27 –1.37

0.23

ns

Co-morbidities

Charlson Index

0.96

0.73–1.27

0.79

ns

0.90

0.74–1.09

0.27

ns

1.09

0.85–1.40

0.51

ns

Charlson Index age-adjusted

1.03

0.81–1.30

0.82

ns

1.17

0.99–1.39

0.01

*

0.98

0.78–1.22

0.83

ns

Diagnosis count

0.91

0.75–1.09

0.30

ns

1.02

0.91–1.13

0.75

ns

1.10

0.95–1.26

0.20

ns

Depression

χ²  =  1.71

0.19

ns

χ²  =  0.15

0.70

ns

χ²  =  0.87

0.35

ns

Tumour with metastases

χ²  =  0.05

0.82

ns

χ²  =  6.21

0.01

*

χ²  =  4.75

0.03

*

Atrial fibrillation

χ²  =  0.44

0,51

ns

χ²  =  5.67

0.02

*

χ²  =  2.14

0.14

ns

Laboratory results

Creatinine pre-OP

0.15

0.02–0.90

0.04

*

1.04

0.95–1.15

0.36

ns

0.46

0.14–1.47

0.19

ns

GFR pre-OP

0.98

0.96–1.00

0.08

ns

0.99

0.98–1.00

0.06

ns

0.99

0.97–1.00

0.10

ns

CRP pre-OP

1.02

0.97–1.06

0.49

ns

1.02

0.99–1.05

0.30

ns

1.03

0.99–1.07

0.10

ns

Quick pre-OP

0.98

0.96–1.01

0.12

ns

0.99

0.97–1.01

0.30

ns

0.98

0.96–1.00

0.04

*

PTT pre-OP

0.98

0.90–1.07

0.70

ns

0.98

0.93–1.04

0.51

ns

0.99

0.92–1.06

0.81

ns

Platelets pre-OP

1.00

1.00–1.00

0.64

ns

1.00

1.00–1.00

0.19

ns

1.00

1.00–1.00

0.49

ns

Haemoglobin post OP

0.92

0.76–1.12

0.43

ns

0.81

0.71–0.92

0.001

***

0.95

0.80–1.12

0.55

ns

Haemoglobin pre-OP

1.09

0.89–1.33

0.42

ns

1.20

1.05–1.37

0.01

**

1.11

0.93–1.33

0.23

ns

Surgery specific factors

Duration of surgery

1.00

1.00–1.01

0.03

*

1.00

1.00–1.01

0.002

**

1.00

1.00–1.01

0.20

ns

Spinal levels of surgery

1.32

0.97–1.81

0.08

ns

0.73

0.56–0.97

0.03

*

0.68

0.50–0.92

0.01

*

Blood loss

1.00

1.00–1.00

0.01

**

1.00

1.00–1.00

0.81

ns

1.00

1.00–1.00

0.05

*

Instrumentation

2.00

0.44–9.15

0.37

ns

1.25

0.43–3.60

0.68

ns

1.06

0.42–2.70

0.90

ns

Use of cement

0.70

0.16–3.06

0.64

ns

0.95

0.29–3.17

0.93

ns

0.95

0.30–2.98

0.92

ns

Inpatient factors

Discharge not home

0.60

0.30–1.23

0.16

ns

1.16

0.75–1.82

0.50

ns

0.96

0.63–1.46

0.86

ns

Length of stay

1.03

0.99–1.07

0.17

ns

1.05

1.01–1.09

0.02

*

1.03

1.01–1.05

0.001

***

Transfusion count

1.06

0.65–1.73

0.82

ns

0.82

0.55–1.23

0.35

ns

1.22

0.86–1.72

0.27

ns