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From: Population-Based Assessment of Determining Treatments for Prostate Cancer JAMA Oncol. 2015;1(1):60-67. doi:10.1001/jamaoncol.2014.192 Figure Legend: Source of Variation for Each Treatment TypeOnly a small proportion of variation of treatment type is attributed to tumor characteristic, region, and year. The variation in the decision to pursue radical prostatectomy is significantly affected by patient demographics (40%), referral to other specialists (24%), and unexplained surgeon factors (23%). The variation in the decision to pursue radiotherapy is significantly affected by referral to other specialists (44%), as well as unexplained surgeon (20%) and patient factors (30%). The variation in the decision to pursue watchful waiting or active surveillance (WW-AS) is significantly affected by Copyright © 2015 American Medical Date of download: 5/11/2017 unexplained patient factors (58%). Association. All rights reserved.