Sample size calculation
breast cancer, cognitive deterioration, Cancer
BREAST CANCER, CANCER
Based on our previous psychometric study of the Functional Assessment of Cancer Therapy – Cognitive Function (FACT-Cog) questionnaire, a decrease of 6.9–10.6 points (4.7–7.2% of the total score) in the FACT-Cog corresponds to the threshold for clinically significant cognitive deterioration in breast cancer patients [