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Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit  cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at OPM.gov.


Participants Years enrollment close-out today
Baseline Questionnaire (BQ) ~154,000 1993-2001
Dietary Questionnaire I-only (DQX) ~63,000 1993-2001
Diet History Questionnaire (DHQ) ~119,000 1998-2004
Supplemental Questionnaire (SQX) ~104,000 2006-2007
Medical Use Questionnaire (MUQ) ~60,000 2013
Brief Survey (BCQ) ~47,000 2017-2018
Cancers Active Tracking for Cancer State Cancer Registry Linkage*
Deaths Complete Mortality Data
* Cancer registry data is restricted, limited access only.

Baseline (BQ)

The Baseline Questionnaire (BQ) is the baseline risk factor questionnaire and contains participant-reported information such as demographics and medical history. The form was offered to all participants, and 96.8% were completed and collected. Compliance was slightly higher in the intervention arm (97.6%) than in the control arm (96.0%). The form may have been completed before or after the participant was randomized, but most (81%) were collected within one month of randomization and nearly all (96%) were collected within three months.

Baseline Questionnaire data and documentation are incorporated into each of the cancer datasets.

Summary Available Data
  • Participant-reported data
  • Covers ~150,000 participants
  • Of collected forms, 98% completed between 2.3 months prior and 5.3 months after randomization
  • Median time into study collected: 0 years
  • Median time remaining after collection: 13 years
  • Forms used:
  • Form completion details
  • Demographics
  • Smoking history
  • Family history of cancer
  • Height, weight and BMI
  • NSAIDS
  • Medical conditions & history of disease
  • Personal history of cancer
  • Female-specific information
  • Male-specific information
  • Screening prior to baseline