Table 2.

The Perceived Influence of Risk and Benefit on Decision Making on a 100-point Scale^*

Influence on Decision	Aspirin All, RB†/BR	CEA All, RB†/BR	EC/IC All, RB†/BR	P Value‡
Health risk associated with stroke	78.1, 78.1/78.0	80.0, 79.3/80.7	75.5, 75.7/75.4	.11
Health risk associated with intervention	55.4, 55.0/55.7	59.7, 57.8/61.5	63.1, 64.7/61.6	<.01
Health benefit associated with intervention	76.5, 75.5/77.3	80.9, 79.0/82.6	75.3, 74.5/76.1	<.05

^*0 = “No influence,” 100 = “great influence” as reported by subjects reviewing treatment scenarios for symptomatic carotid stenosis. Mean values for all subjects randomized to each treatment of stroke are shown first, followed by mean values in each of the 2 information order arms.

^†For each treatment of stroke, the influence of health risks and benefits on the decision making of subjects in the 2 information order arms (RB = Risk then Benefit Information, BR = Benefit then Risk Information) did not differ significantly (P > .05).

^‡P values are for comparison across treatment arms. Within each treatment, there were no significant differences between the RB and BR order arms.

CEA, carotid endarterectomy surgery; EC/IC, extracranial-intracranial bypass surgery.