The online case-crossover study is a novel approach to study triggers for recurrent disease flares

Yuqing Zhang, Christine E. Chaisson, Timothy McAlindon, Ryan Woods, David J. Hunter, Jingbo Niu, Tuhina Neogi, David T. Felson

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: To evaluate the feasibility of conducting an online case-crossover study of triggers for recurrent disease flares. Methods: We conducted an online case-crossover study of triggers for recurrent flares using gout as a paradigm. We constructed a Web site and recruited individuals with history of gout via the Internet. We confirmed gout diagnosis by reviewing each subject's medical records. We collected via the Internet exposure information during the intercritical period using a scheduled Control-period Questionnaire, and prior to recurrent gout attacks using a Hazard-period Questionnaire. Results: Over 10 months we recruited 197 subjects with a history of gout from 41 states and the District of Columbia. We obtained medical records from 172 subjects. All participants had experienced at least one recurrent attack and filled out required questionnaires. The median time between the date of an attack and the date of logging on to the Web site was 2 days. The incidence rate of recurrent gout attacks was 1.03 per person-year. Longer disease duration and presence of comorbidities appeared to increase the risk of recurrent flares. Conclusion: The results of this study demonstrate that a case-crossover study can be successfully conducted through the Internet. This approach has broad applicability to other diseases typified by recurrent attacks.

Original languageEnglish (US)
Pages (from-to)50-55
Number of pages6
JournalJournal of Clinical Epidemiology
Volume60
Issue number1
DOIs
StatePublished - Jan 1 2007

Keywords

  • Case-crossover study
  • Epidemiological methods
  • Gout
  • Internet
  • Recurrent attacks
  • Triggers

ASJC Scopus subject areas

  • Epidemiology

Fingerprint Dive into the research topics of 'The online case-crossover study is a novel approach to study triggers for recurrent disease flares'. Together they form a unique fingerprint.

Cite this