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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.

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

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

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

Supplemental (SQX)

A Supplemental Questionnaire (SQX) was introduced in 2006, 13 years into the trial. The contents of this questionnaire largely overlap with information collected on the baseline questionnaire (BQ). Some of the overlapping information is data that would not be expected to change between the BQ and the SQX (e.g. race-ethnicity). Other variables may reasonably change between the two questionnaires (e.g. marital status, smoking status, diseases). The SQX additionally contains some data not collected on the BQ (e.g., physical activity).

Ultimately, about 104,000 questionnaires were collected. Given the late administration of the SQX, the median time in the trial following a completion of this form is 3 years.

SQX data can be obtained in the SQX dataset

Summary Available Data
  • Participant-reported data
  • Covers ~104,000 participants
  • Introduced in 2006
  • Median time into study collected: 9 years
  • Median time remaining after collection: 3 years
  • Forms used:
  • Form completion details
  • Demographics
  • Family history
  • BMI and physical activity
  • Health history and Medication
  • Smoking history
  • Female-specific information
  • Male-specific information

Medication Use (MUQ)

The Medication Use Questionnaire (MUQ) was administered in 2013. The questionnaire primarily asked participants about medication use. Participants were asked to provide information on aspirin, acetaminophen, and nonsteroidal anti-inflammatory drug (NSAID) use in the 12 months prior to form completion, and to list all prescription medications taken within 30 days of form completion. The MUQ also asked participants to provide their current weight and smoking status, and asked for consent to collect participants' Medicare data.

Approximately 59,000 MUQ questionnaires were collected. The median time for MUQ completion was 16 years into the trial.

MUQ data can be obtained in the Medication Use Questionnaire datasets.

Summary Available Data
  • Participant-reported data
  • Covers 58,895 participants
  • Administered in 2013
  • Median time into study collected: 16 years
  • Forms used:
  • Form completion details
  • Family history of cancer
  • Aspirin, Acetaminophen, and NSAID usage
  • Prescription drug usage
  • Weight and BMI
  • Smoking status