Fig. 2. Propensity matching analyses: major morbidity results. Odds ratios (confidence intervals [CIs]) of smokers (in previous year) versus never smokers for any major complication (collapsed) and each individual major complication, adjusting for patient age (imbalanced confounder after propensity matching). The CIs for the individual major complications were adjusted using Bonferroni correction. CVA = cerebrovascular accident; SSI = surgical site infection.