Table 4.

Canadian TIA Score: interval likelihood ratios and risk of outcome within 7 days (n=7607)

	Outcome		Interval likelihood ratio (95%CI)	Observed risk (%)	Estimated risk (%)
	Yes	No
Subsequent stroke/carotid revascularisation
Low risk (−3 to 3)	6	1236	0.20 (0.09 to 0.44)	0.5	0.7
Medium risk (4 to 8)	124	5360	0.94 (0.85 to 1.04)	2.3	2.1
High risk (≥9)	52	829	2.56 (2.02 to 3.25)	5.9	6.3
Subsequent stroke
Low risk (−3 to 3)	3	1239	0.17 (0.06 to 0.51)	0.2	0.5
Medium risk (4 to 8)	81	5403	1.04 (0.93 to 1.16)	1.5	1.3
High risk (≥9)	24	857	1.94 (1.36 to 2.78)	2.7	3.3