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There were potentially five 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 and the Medication Use Questionnaire.

Diet History (DHQ)

The Diet History Questionnaire (DHQ) contains dietary information similar to that found in the DQX. 77% of all participants in both arms of the trial completed the DHQ. The form was introduced 5 years into the trial (December 1998). Raw questionnaire responses were processed into analysis-ready variables in terms of gram intake, pyramid servings, food frequencies per day, etc.

Participants in the control arm randomized prior to December 1998 were offered the DHQ in 1999 or 2000, generally around the anniversary of randomization in either year. Control arm participants randomized in/after December 1998 were offered the DHQ at baseline.

Participants in the intervention arm who were randomized prior to December 1995 were offered the DHQ in 1999, generally around the anniversary of randomization. Intervention arm participants randomized in/after December 1995 (third anniversary in/after December 1998) were offered the DHQ generally around their third anniversary of randomization (T3).

DHQ data can be obtained in the DHQ dataset.

Summary Available Data
  • Participant-reported data
  • Covers 113,000 participants
  • Introduced in 1998
  • Median time into study collected: 3 years
  • Median time post-collection: 9 years
  • Forms used:
  • Form completion details
  • Alcohol use
  • 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
Time of Data Acquisition
Time in Study for DHQ. See text version
Text Version