Validation of the WHI Brief Physical Activity Questionnaire among Women Diagnosed with Breast Cancer.

To investigate the psychometric properties of the physical activity (PA) measure of the Women's Health Initiative (WHI). Methods: Women diagnosed with breast cancer and enrolled in the Women's Healthy Eating and Living Study (average age 55 years) wore an accelerometer for 1 week and completed the 7-day Physical Activity Recall (PAR) and brief WHI measure. Results: Both self-reports correlated 0.73 with the accelerometer and had 100% sensitivity for meting the current PA guideline, but specificity was significantly higher for the PAR. Conclusions: The WHI measure had comparable validity, sensitivity, and measurement bias compared to the widely accepted PAR. [ABSTRACT FROM AUTHOR]