Fig. 2From: Incidence of healthcare-associated infections in a tertiary hospital in Beijing, China: results from a real-time surveillance systemMonthly HAI incidence, 2013–2017. Note: aIRR, annual incidence rate ratio. Incidence rate was standardized by age and sex of 2017, the change of time trends was tested by negative binomial regression. Surgical site infections were calculated as the number of infections per 1000 procedures. Other incidence rate of HAI was defined as the number of new HAIs per 1000 patient-daysBack to article page