Receipt of mastectomy by level of patient concern and risk of recurrence. For women who perceived a choice between surgical treatments (n = 409), proportions were adjusted for age, education, race, marital status, medical comorbidity, recurrence risk, and Surveillance, Epidemiology, and End Results Registry site (Wald test, 23.0; P < .001 for radiation concern; and Wald test, 39.9; P < .001 for recurrence concern).