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There were potentially six questionnaires a participant could have completed around the time he/she entered the trial: the Baseline Questionnaire, the Supplemental Questionnaire, the Dietary Questionnaire, the Diet History Questionnaire, the Medication Use Questionnaire, and the Brief Survey Questionnaire.

Dietary (DQX)

The Dietary Questionnaire (DQX) was offered to intervention arm participants around the time they were randomized. 82% of the intervention arm completed a DQX. Control arm participants were not offered the DQX. The form may have been completed before (<1%) or after the participant was randomized, but about half (47%) were collected within one month of randomization and most (90%) were collected within three months.

Raw questionnaire responses were processed into analysis-ready variables in terms of gram intake, pyramid servings, food frequencies per day, etc.

DQX data can be obtained in the DQX dataset.

Summary Available Data
  • Participant-reported data
  • Covers ~61,000 participants
  • Intervention arm only
  • Of collected forms, 98% completed between day of randomization and 8.1 months after randomization
  • Median time into study collected: 0 years
  • Median time post-collection: 13 years
  • Forms used:
  • Form completion details
  • Lifestyle (alcohol use and physical activity)
  • Nutrient intake
  • Supplement intake
  • Glycemic index/load
  • Meat-specific variables
  • Pyramid servings
  • Daily grams of various foods and beverages
  • Daily frequencies of various foods and beverages
  • Raw questionnaire responses