Comparisons of total and subscale (General, Physical, Mental, Emotional and Vigor) scores of the Multidimensional Fatigue Symptom Inventory-Short Form (MFSI-SF) between BC patients and controls over time (mean+SE). Higher scores indicate more fatigue, except Vigor subscale, where a higher score indicates less fatigue. Baseline=before the start of chemotherapy, Cycle-4=at the end of cycle 4 of chemotherapy. Compared to controls at the same time point: * p<0.05, ** p<0.01, *** p<0.0001; compared to Baseline for the same group: † p<0.05, †† p<0.01, ††† p<0.0001.