|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|
|Collection of Cancers|
|Collection of Mortality|
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.