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Comparison between groups. The mean total deficit scores are shown by the dashed line for each of the two groups. The mean of the carotid endarterectomy (CEA) regional group is significantly different from the mean of the control group (P = 0.0002). The solid line represents two standard deviations above the mean of the control group. The triangles represent total deficit scores for patients with some triangles representing more than one patient.
