Efficiency loss from categorizing quantitative exposures into qualitative exposures in case-control studies.

@article{Zhao1992EfficiencyLF,
  title={Efficiency loss from categorizing quantitative exposures into qualitative exposures in case-control studies.},
  author={Lue Ping Zhao and Laurence N. Kolonel},
  journal={American journal of epidemiology},
  year={1992},
  volume={136 4},
  pages={464-74}
}
In the analysis of data from case-control studies, quantitative exposure variables are frequently categorized into qualitative exposure variables, such as quarters. The qualitative exposure variables may be scalar variables that take the median values of each quantile interval, or they may be vectors of indicator variables that represent each quantile interval. In a qualitative analysis, the scalar variables may be used to test the dose-response relation, while the indicator variables may be… CONTINUE READING

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