Table 5.

Multivariate logistic regression analysis of risk factors for postoperative 90-day complications

Variables	OR	95% CI	P value
Age-adjusted Charlson Comorbidity Index (score > 4 vs. Score ≤ 3)	5.264	1.584–17.496	0.007
Intraoperative blood loss (ml)	1.004	1.001–1.008	0.025

Note: Unconditional multivariable logistic regression by backward selection was performed for age-adjusted Charlson Comorbidity Index, extent of resection, systemic lymph node dissection, operation time, intraoperative blood loss, and pathology of pulmonary lesion as initial variables. Variable selection was based on maximum likelihood estimation, with Inclusion α = 0.05 and Exclusion α = 0.10, respectively. Finally, the variables that reached the statistical difference were age-adjusted Charlson Comorbidity Index and intraoperative blood loss

Abbreviation: CI: confidential interval; ml: milliliter; OR: Odds ratio;