Study Design
cancer, Cancer
CANCER, CANCER
The PLCO Cancer Screening Trial study design has been described elsewhere.To complete the current analysis, we implemented additional exclusion criteria. Participants were excluded from the final analysis for the following reasons: (1) no valid baseline questionnaire (BQ), (2) BMI or aspirin use information was incomplete, (3) any personal history of cancer, and (4) discordant responses between the BQ and supplemental questionnaire (SQ), if the SQ was completed and valid and responses were used for analysis (