Fig. 1

Cumulative incidences of postoperative pneumonia and postoperative reduced oxygenation index (< 300 mmHg) of the unmatched patient cohort. Black line: statin-naïve patients [statin( −) group, n = 91]. 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 all unmatched patients. Asterisk indicates significant differences in the cumulative incidence of postoperative pneumonia between both groups at postoperative day 30 (p = 0.0030). b Kaplan–Meier estimation of cumulative incidences of reduced oxygenation index (PaO₂/FiO₂ < 300 mmHg) of all unmatched patients. No difference between both groups was observed at postoperative day 10 (p = 0.1063)