Accumulative occlusion time correlates with postoperative pulmonary complications in patients undergoing pelvic and sacrum tumor resection assisted by abdominal aortic balloon occlusion: a retrospective cohort study

Table 3 Multicollinearity test of risk factors of PPCs

Risk factors	VIF	Tolerance
Age (y)	1.16	0.859
ASA grade	1.16	0.861
Preoperative albumin (g/L)	1.06	0.946
Duration of surgery (h)	1.93	0.518
Estimated blood loss (L)	1.85	0.542
Accumulative occlusion time (min)	1.57	0.637

Abbreviation: PPCs postoperative pulmonary complications, ASA American Society of Anesthesiologists, VIF variance inflation factor

ISSN: 1471-2474