The effect of migration on comparison of disease rates in geographic studies in the United States.

@article{Polissar1980TheEO,
  title={The effect of migration on comparison of disease rates in geographic studies in the United States.},
  author={Lincoln Polissar},
  journal={American journal of epidemiology},
  year={1980},
  volume={111 2},
  pages={175-82}
}
Cancer rates are often compared between counties or other geographic units as a method of testing for risk from environmental exposures. Migration between geographic areas greatly reduces the sensitivity of this method. Under simplifying assumptions the quantitative effect of migration on risk estimates is shown using migration and cancer incidence data for the United States. For example, 40--50% of the relative excess risk, defined as the relative risk minus one, is not reflected in the… CONTINUE READING

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