Fig. 3

Trends in the standardized infection ratio among the medical institutions registered in JANIS, 2012–2017. Panels are shown separately for A esophagectomy, B gastrectomy, C total gastrectomy, D distal gastrectomy, E colon surgery, and F rectal surgery. The standardized infection ratio (SIR) was calculated using the 2013 data as a reference, correcting for patient status severity. A year with an SIR value > 1 had a higher frequency of surgical site infection events than in 2013, indicating that the medical facility's performance was lower than that in 2013. The solid circles represent the overall SIR numbers, and the errors bars (whiskers) indicate the 95% confidence intervals. Similarly, the open triangles and solid squares indicate SIRs for open surgery and laparoscopic surgery, respectively. JANIS Japan Nosocomial Infections Surveillance