Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12874-018-0500-3/MediaObjects/12874_2018_500_Fig1_HTML.png)
Model A: The four state Multistate Model; 0 is “Admission” without hospital acquired infection (HI); 1 is hospital acquired “Infection”; 2 is the status of the patients who are “Discharged Alive” and 3 is the “Death” of the patient in the hospital. The constant hazard rates, α01 is the hazard rate to acquire the hospital infection during the hospital stay; α02 is the hazard rate to be discharged alive without the HI; α03 is the hazard rate to dead without the HI and α12 is the hazard rate to be discharged alive after the HI; α13 is the hazard rate to be dead after the HI