Table 4. Descriptive characteristics of the patients in the Caen data set as compared with those in the Cambridge samples.

	Caen (n=30)	Cambridge (n=7)	P-value
Age, years	73.6±10.2	62.2±20.2	0.04
Gender, male	14 (47%)	4 (57%)	0.7
Risk factors
Hypertension	17 (57%)	3 (50%)	0.7
Hypercholesterolemia	4 (13%)	1 (17%)	1.0
Diabetes	3 (10%)	0 (0%)	1.0
Stroke onset to PET, hours	10.7±3.6	18.6±5.0	<0.001
Side (left/right)	15/15	2/5	0.4
NIHSS scorea	10 (4–18)	10 (9–17)	0.6
Ipsilateral carotid diseaseb			0.7
<50%	21 (72%)	5 (57%)
50% to 99%	6 (21%)	2 (29%)
Occlusion	2 (7%)	0

NIHSS, National Institutes of Health Stroke Scale; PET, positron emission tomography.

Data are presented as mean±s.d. for continuous variables or n (%) for scale variables.

^aClinical scores for the Caen data originally obtained with the Orgogozo scale have been converted to NIHSS scores; data presented are median and interquartile ranges.

^bOne Cambridge patient had an ipsilateral carotid dissection and one from Caen was not assessed.