Table 3 Risk factor for perioperative systemic complications with multivariable logistic regression analysis

 65 to 74

Reference

 75 to 84

1.38

0.007**

1.09–1.74

 Over 85

1.40

0.054

0.99-1.97

 Scheduled

Reference

 Unscheduled

1.16

0.18

0.93–1.45

 0 to 10

1.52

0.001**

1.19–1.94

 11 to 20

Reference

 Unknown

1.49

0.008**

1.11–1.99

 Atrial fibrillation

2.14

0.006**

1.25–3.65

 Renal failure

2.29

0.007**

1.25–4.20

 Posterior fusion

Reference

 Anterior fusion

1.73

< 0.001***

1.35–2.22