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This page describes the PLCO Questionnaires data available on this website. An overall User Guide and forms used to collect the data are provided. For each dataset, a data dictionary and a file containing SAS proc format code are publicly available. You may begin a new project to request access to the actual datasets. Data will be delivered once the project is approved.

  1. Baseline Questionnaire (BQ)
  2. Dietary Questionnaire (DQX)
  3. Diet History Questionnaire (DHQ)
  4. Supplemental Questionnaire (SQX)