Rochester Epidemiology Project data exploration portal

Jennifer L. St. Sauver, Brandon R. Grossardt, Lila J.Finney Rutten, Veronique L. Roger, Michelle Majerus, Daniel W. Jensen, Scott M. Brue, Cynthia M. Bock-Goodner, Walter A. Rocca

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Introduction The goal of this project was to develop an interactive, web-based tool to explore patterns of prevalence and co-occurrence of diseases using data from the expanded Rochester Epidemiology Project (E-REP) medical records-linkage system. Methods We designed the REP Data Exploration Portal (REP DEP) to include summary information for people who lived in a 27-county region of southern Minnesota and western Wisconsin on January 1, 2014 (n = 694,506; 61% of the entire population). We obtained diagnostic codes of the International Classification of Diseases, 9th edition, from the medical records-linkage system in 2009 through 2013 (5 years) and grouped them into 717 disease categories. For each condition or combination of 2 conditions (dyad), we calculated prevalence by dividing the number of persons with a specified condition (numerator) by the total number of persons in the population (denominator). We calculated observed-to-expected ratios (OERs) to test whether 2 conditions co-occur more frequently than would co-occur as a result of chance alone. Results We launched the first version of the REP DEP in May 2017. The REP DEP can be accessed at Users can select 2 conditions of interest, and the REP DEP displays the overall prevalence, age-specific prevalence, and sex-specific prevalence for each condition and dyad. Also displayed are OERs overall and by age and sex and maps of county-specific prevalence of each condition and OER. Conclusion The REP DEP draws upon a medical records-linkage system to provide an innovative, rapid, interactive, free-of-charge method to examine the prevalence and co-occurrence of 717 diseases and conditions in a geographically defined population.

Original languageEnglish (US)
Article number170242
JournalPreventing Chronic Disease
Issue number4
StatePublished - Apr 1 2018

ASJC Scopus subject areas

  • Health Policy
  • Public Health, Environmental and Occupational Health


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