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. 2017 Mar 8;112(3):520–523. doi: 10.1038/ajg.2016.584

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Copyright © 2017 American College of Gastroenterology

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Hazard ratios for pre-treatment and treatment periods, and PERR-adjusted hazard ratios for the full sample and by comorbidity and age groups (log-scale). Confidence intervals for PERR analyses were calculated using bootstrapping techniques. 95%CI, 95% confidence interval; CCI, Charlson Comorbidity Index; HR, hazard ratio; HR_PERR=HR_{Treatment period}/HR_{Pre-treatment period}; PERR, Prior Event Rate Ratio.