The American Cancer Society Cancer Prevention Study-3 FFQ Has Reasonable Validity and Reproducibility for Food Groups and a Diet Quality Score

FFQs are commonly used to assess dietary intake and it is important to evaluate their performance in the target population.We evaluated the reproducibility and relative validity of the Cancer Prevention Study-3 (CPS-3) FFQ in estimating usual intake of 63 food groups and diet quality in accordance with the American Cancer Society dietary guidelines for cancer prevention.A subset of participants from the CPS-3 (433 women, 244 men), 31-70 y of...