Table 2.

Infarct and stroke risk

	Stroke	No stroke
CT and MRI, and occurrence of stroke (at 90 days)1
Old or new infarct either on CT or MRI	22	330
No infarct detected on both CT and MRI	21	617
Total	43	947
CT and MRI, and occurrence of stroke (at 90 days)2
Old infarct either on CT or MRI	13	141
No infarct detected on both CT and MRI	21	617
Total	34	758
1 Fisher's exact test, p = 0.034, OR = 1.96 (1.06–3.62).
2 χ2 test, p = 0.005, OR = 2.71 (1.33–5.54).