Biochemical markers as additional measurements in dietary validity studies: application of the method of triads with examples from the European Prospective Investigation into Cancer and Nutrition.

@article{Ock1997BiochemicalMA,
  title={Biochemical markers as additional measurements in dietary validity studies: application of the method of triads with examples from the European Prospective Investigation into Cancer and Nutrition.},
  author={Marga C. Ock{\'e} and Rudolph J Kaaks},
  journal={The American journal of clinical nutrition},
  year={1997},
  volume={65 4 Suppl},
  pages={1240S-1245S}
}
The validity coefficient of dietary questionnaire measurements can be estimated from a triangular comparison between questionnaire, reference, and biochemical marker measurements with the method of triads. The method assumes that the measurements are linearly related to true intake and have independent random errors. We applied the method of triads to examples from the European Prospective Investigation into Cancer and Nutrition. In some examples, Heywood cases occurred, ie, the estimated… CONTINUE READING
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