Agreement between interview data and a self-administered questionnaire on dietary supplement use.

@article{Dorant1994AgreementBI,
  title={Agreement between interview data and a self-administered questionnaire on dietary supplement use.},
  author={Elisabeth Dorant and Piet A van den Brandt and R Alexandra Goldbohm and Rudolph J. J. Hermus and Ferd Sturmans},
  journal={European journal of clinical nutrition},
  year={1994},
  volume={48 3},
  pages={180-8}
}
OBJECTIVE To study the relative validity of an open-ended question on the consumption of dietary supplements in the preceding five-year period, incorporated in a self-administered questionnaire used in the NLCS, The Netherlands Cohort Study on diet and cancer (120,852 men and women aged 55-69 years). DESIGN Questionnaire data were compared with reference information from three personal interviews carried out within a period of 10 months. SETTING AND SUBJECTS A randomly selected subgroup (59… CONTINUE READING

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