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Unadjusted adjuvant trastuzumab completion rates (95% CIs) by (A) age and (B) comorbidity; (C) trastuzumab completion rates by age and comorbidity (comorbidity includes patients with 1 and 2+ comorbidities). Y-axes indicate age groups, left, and hazard ratios with CIs, right. Overall P values determined by χ2 testing.
