Table 6. Variance inflation factor test results.

Respiratory complications
	Unplanned reintubation a	Pneumonia b	Prolonged ventilation c
Predictor variables	Variance inflation	Variance inflation	Variance inflation
ASA class	2.068	2.069	2.070
Disseminated cancer	–	–	–
Dyspnea	1.225	1.225	1.228
Gender	1.007	1.011	–
Operation time	1.146	1.153	1.153
Renal failure	–	–	1.091
Sepsis	1.077	1.159	1.161
Smoker status	1.019	1.010	1.015
Ventilator dependence	1.256	1.257	1.281
Wound classification	–	1.095	1.091
Wound infection	1.107	1.108	1.108
Cardiac complications and mortality
	Cardiac arrest d	Myocardial infarction e	Mortality f
Predictor variables	Variance inflation	Variance inflation	Variance inflation
ASA class	2.050	–	2.003
Disseminated cancer	–	–	1.028
Dyspnea	1.226	–	1.229
Gender	1.004	–	1.008
Operation time	1.145	–	–
Renal failure	1.092	1.055	1.092
Sepsis	1.077	1.052	1.079
Smoker status	–	–	1.019
Ventilator dependence	1.249	–	1.278
Wound classification	–	–	–
Wound infection	–	1.069	1.107

Abbreviation: ASA class, American Society of Anesthesiologists classification of physical status.

^aAdjusted for ASA class, gender, operation time, sepsis, smoker status, ventilator dependence, wound infection.

^bAdjusted for ASA class, dyspnea, gender, operation time, sepsis, smoker status, ventilator dependence, wound class, wound infection.

^cAdjusted for ASA class, dyspnea, operation time, renal failure, sepsis, smoker status, ventilator dependence, wound class, wound infection.

^dAdjusted for ASA class, dyspnea, gender, operation time, renal failure, sepsis, ventilator dependence.

^eAdjusted for renal failure, sepsis, wound infection.

^fAdjusted for ASA class, disseminated cancer, dyspnea, gender, renal failure, sepsis, smoker status, ventilator dependence, wound infection.