Table 4.

Stroke risk of carotid stenosis ≥70% compared with normal Doppler

	Stroke	No stroke	OR (95% CI)	p valuea
Within 7 days
Doppler stenosis ≥70%	2	25	6.91 (1.10–43.30)	0.071
Normal Doppler	3	259
Within 30 days
Doppler stenosis ≥70%	4	23	6.34 (1.73–23.26)	0.013
Normal Doppler	7	255
Within 90 days
Doppler stenosis ≥70%	4	23	3.62 (1.08–12.14)	0.050
Normal Doppler	12	250

^aFisher's exact test.