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. 2018 Mar 3;8(3):e018818. doi: 10.1136/bmjopen-2017-018818

Table 4.

Cox proportional hazard regression analysis for the risk of pyogenic liver abscess by endoscopic sphincterotomy and cholangitis

Variables Event Person-years Rate† Adjusted HR‡ (95% CI) P value
Endoscopic sphincterotomy Cholangitis 0.03
 No  No 25 32 177 0.78 1 (reference)
 No  Yes 8 2936 2.72 3.77 (1.69 to 8.41)**
 Yes  No 122 30 378 4.02 5.48 (3.56 to 8.44)***
 Yes  Yes 27 5076 5.32 6.64 (3.82 to 11.5)***

*P<0.05, **P<0.01, ***P<0.001.

†Per 1000 person-year.

‡Model was adjusted for age, sex and other comorbidities.