Fig. 2

Cumulative incidences of postoperative pneumonia and postoperative reduced oxygenation index (< 300 mmHg) of the matched patient cohort by propensity score. Black line: statin-naïve patients [statin( −) group, n = 52]. Gray line: patients with perioperative statin medication [statin( +) group, n = 26]. Patients who were discharged, died, or suffered from re-do (revision) surgery were censored from the analysis of cumulative incidences since the day of the event. Vertical ticks indicate censored data. a Kaplan–Meier estimation of cumulative incidences of postoperative pneumonia of matched patients. Asterisk indicates significant differences in the cumulative incidence of postoperative pneumonia between both groups at postoperative day 30 (p = 0.0468). b Kaplan–Meier estimation of cumulative incidences of reduced oxygenation index (PaO₂/FiO₂ < 300 mmHg) of matched patients. No difference between both groups was observed at postoperative day 10 (p = 0.2980)