The ABCD and ABCD2 Scores and the Risk of Stroke following a TIA: A Narrative Review

Table 4

Population year location/type	𝑁 (Total Number)	Stroke risk (𝑛)	% of all strokes in 2 days and 7 days out of 90 days
Johnston et al. 2000 [9]	1707	2-day risk = 83	2 days—46%
USA		7-day risk = 103	7 days—57%
ED based		90-day risk = 180
Johnston et al. 2007 [16]	1069	2-day risk = 51	2 days—48%
USA		7-day risk = 71	7 days—67%
Outpatient		90-day risk = 106
Johnston 2007 [16]	962	2-day risk = 16	2 days—29%
USA		7-day risk = 29	7 days—52%
ED based		90-day risk = 56
OCSP 1986 [10]	203	2-day risk = 9	2 days—31%
Population		7-day risk = 17	7 days—59%
UK		90-day risk = 29
OXVASC 2004 [10]	188	2-day risk = 13	2 days—39%
Population		7-day risk = 20	7 days—61%
UK		90-day risk = 33
OXFORD 2005 [10]	315	2-day risk = 9	2 days—41%
Outpatient Clinic, UK		7-day risk = 17	7 days—77%
		90-day risk = 22
Cucchiara et al. 2007 [38]	167	2-day risk = 4	2 days—80%
Dedicated Unit		7-day risk = 4	7 days—80%
USA		90-day risk = 5
Tsivgoulis et al. 2004 [21]	226	2-day risk = na	2 days—na
ED		7-day risk = 18	7 days—78 %
Greece		90-day risk = 23
Bray et al. 2004 [33]	98	2-day risk = na	2 days—na
ED		7-day risk = 4	7 days—57%
Australia		90-day risk = 7
Calvet et al. 2007 [24]	343	2-day risk = 4	2 days—40%
Dedicated Unit		7-day risk = 5	7 days—50%
France		90-day risk = 10
Purroy et al. 2005 [19]	204	2-day risk = 2	2 days—33%
ED		7-day risk = 3	7 days—50%
Spain		90-day risk = 6
Asimos et al. 2008 [25]	1054	2-day risk = na	2 days—na
ED		7-day risk = 69	7 days—na
USA		90-day risk = na
Fothergill et al. 1994 [23]	284	2-day risk = na	2 days—na
Population based		7-day risk = 36	7 days—na
USA		90-day risk = na
Mlynash et al. [39] 2005	99	2-day risk = 0	2 days—0%
USA		7-day risk = 1	7 days—100%
Dedicated		90-day risk = 1
Unit
Ay et al. [40] 2006	586	2-day risk = 15	2 days—na
USA		7-day risk = 28	7 days—na
Dedicated Unit		90-day risk = na
EXPRESS 2007	160	2-day risk = 1	2 days—100%
UK		7-day risk = 1	7 days—100%
Dedicated Unit		90-day risk = 1
Intervention	1466
SOS-TIA 2005		2-day risk = 2	2 days—12%
France		7-day risk = 5	7 days—29%
Dedicated Unit		90-day risk = 17
Intervention
Sciolla and Melis[20]	274	2-day risk = 7	2 days—47%
2006		7-day risk = 10	7 days—67%
Italy		90-day risk = 15
ED
Coutts et al. [41]	111	2-day risk = 2	2 days—33%
2006		7-day risk = 4	7 days—67%
Canada		90-day risk = 6
ED	292
Sheehan et al. [42]		2-day risk = 3	2 days—11%
2007		7-day risk = 11	7 days—39%
Ireland		90-day risk = 28
Population