biostudies-literatureUnknown5(2)James PD<h4>Background</h4>Endoscopic ultrasonography is a safe and accurate modality for evaluating and managing hepatobiliary and gastrointestinal conditions (malignant and nonmalignant); its use is increasing. The aim of this study was to describe regional trends in the use of endoscopic ultrasonography in Ontario.<h4>Methods</h4>We conducted a population-based retrospective cohort study using health administrative databases. We identified all patients who underwent an endoscopic ultrasound procedure in Ontario from 2003 to 2011 using physician billing data. Patient, physician and institution characteristics were examined. The primary outcome was use of endoscopic ultrasonography.<h4>Results</h4>We identified 9076 endoscopic ultrasound procedures performed in 8001 patients (3858 women [48.2%]; CMAJ openE437-E443https://www.ebi.ac.uk/biostudies/studies/S-EPMC5498178biostudies-literatureRegional differences in use of endoscopic ultrasonography in Ontario: a population-based retrospective cohort study.PMC5498178Antonova LHegagi MJames PDHeitman SJYong ETinmouth JSimone CYeung EfalseRegional differences in use of endoscopic ultrasonography in Ontario: a population-based retrospective cohort study.<h4>Background</h4>Endoscopic ultrasonography is a safe and accurate modality for evaluating and managing hepatobiliary and gastrointestinal conditions (malignant and nonmalignant); its use is increasing. The aim of this study was to describe regional trends in the use of endoscopic ultrasonography in Ontario.<h4>Methods</h4>We conducted a population-based retrospective cohort study using health administrative databases. We identified all patients who underwent an endoscopic ultrasound procedure in Ontario from 2003 to 2011 using physician billing data. Patient, physician and institution characteristics were examined. The primary outcome was use of endoscopic ultrasonography.<h4>Results</h4>We identified 9076 endoscopic ultrasound procedures performed in 8001 patients (3858 women [48.2%]; 2017-01-01T00:00:00Z2017 Jun2025-04-05T11:22:17.891Z2019-03-27T02:49:31ZS-EPMC54981782860044910.9778/cmajo.20160153