Overall, 18,832 patients underwent CEA (18,551 NORAD, 281 RAD). Baseline demographics differed in the following: the RAD group more frequently had history of contralateral carotid artery stenting (1.4% vs. 0.3%, P = 0.009), anatomic high risk features (12.8% vs. 1.3%, P < 0.001) and contralateral carotid occlusion (5.3% vs. 2.4%, P = 0.005). The NORAD cohort was more frequently female (38.9% vs. 29.5%, P < 0.001), ASA class 4 or 5 (8.0% vs. 4.6%, P = 0.035), higher body mass index (28.3 ± 5.6 vs.