J Cancer Surviv

PurposeSelf-reported weight, height and body mass index (BMI) are commonly used in cancer epidemiology studies, but information on the validity of self-reports among cancer survivors is lacking. This study aimed to evaluate the validity of these self-reported measures among African American (AA) breast cancer survivors, known to have a high obesity prevalence.MethodsWe compared the self-reported and measured values among 243 participants from the Women\u2019s Circle of Health Follow-Up Study (WCHFS), a population-based longitudinal study of AA breast cancer survivors. Multivariable-adjusted linear regressions were used to identify factors associated with reporting errors. We also examined the associations of self-reported and measured BMI with obesity-related health outcomes using multivariable logistic regressions, with hypertension as an example, to evaluate the impact of misreporting.ResultsWe found that self-reported and measured values were highly correlated among all and when stratified by participants\u2019 characteristics (intraclass correlation coefficients 650.99, 0.84 and 0.96 for weight, height and BMI, respectively). The agreement between BMI categories (normal, overweight and obese) based on self-reported and measured data was excellent (kappa=0.81). Women who were older, never smoked, had higher grade tumors or greater BMI tended to have over-estimated BMI calculated from self-reported weight and height. The BMI-hypertension association was similar using self-reported (OR per 5 kg/m2 increase: 1.63; 95% CI: 1.27\u20132.10) and measured BMI (1.58; 95% CI: 1.23\u20132.03).ConclusionsSelf-reported weight, height and BMI were reasonably accurate in the WCHFS.ImplicationsOur study supports the use of these self-reported values among cancer survivors when direct measurements are not possible.U58 DP003931/DP/NCCDPHP CDC HHS/United StatesK01 CA193527/CA/NCI NIH HHS/United StatesP30 CA016056/CA/NCI NIH HHS/United StatesP30 CA072720/CA/NCI NIH HHS/United StatesP01 CA151135/CA/NCI NIH HHS/United StatesHHSN261201300021C/CA/NCI NIH HHS/United StatesHHSN261201300021I/CA/NCI NIH HHS/United StatesR01 CA185623/CA/NCI NIH HHS/United StatesR01 CA100598/CA/NCI NIH HHS/United States2019-08-01T00:00:00Z29536415PMC60545486517vault:3056