Comparison of case ascertainment by medical record linkage and cohort follow-up to determine incidence rates for transient ischemic attacks and stroke

Jack P. Whisnant, L. Joseph Melton, Patricia H. Davis, W. Michael O'Fallon, Katsuya Nishimaru, Bruce S. Schoenberg

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

During the period 1960-1972, the medical record linkage index method provided an estimated average annual age- and sex-adjusted rate for first transient ischemic attack (TIA) of 134 per 100,000 population for those age 50 years and older. The cohort method estimate was 237 per 100,000 population (95% confidence limits (CL), 165-310). The discrepancy was due to 18 cases of TIA noted at the time of patient visits in the cohort analysis that were not identified from the medical record analysis. The cohort analysis for all strokes at age 50 years and older was not significantly different from the medical record linkage analysis. Although the cohort follow-up method provided better case ascertainment in this study, current indexing procedures provide case ascertainment equal to that of the cohort method and at less cost. No trend was found to suggest that incidence rates for TIA were decreasing in the period 1955-1979, in contrast to stroke in Rochester, Minn.

Original languageEnglish (US)
Pages (from-to)791-797
Number of pages7
JournalJournal of Clinical Epidemiology
Volume43
Issue number8
DOIs
StatePublished - 1990

Keywords

  • Cohort analysis
  • Incidence rate
  • Medical record linkage analysis
  • Stroke
  • Transient ischemic attack (TIA)

ASJC Scopus subject areas

  • Medicine(all)
  • Epidemiology
  • Public Health, Environmental and Occupational Health

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