Table 3:

Characteristics of patients and hemiespheres in study

	Characteristic	Value
By patient (n=25)
Demographic data
	Age in yrs, mean ± SD	42 ± 13.5
	Female sex	20 (80%)
	Race:
	Asian/Pacific Islander	3 (12%)
	Black/African American	8 (12%)
	White/Caucasian, Hispanic/Latino	1 (4%)
	White/Caucasian, non-Hispanic/Latino	13 (52%)
Clinical data
	Bilateral moyamoya	22 (88%)
	Days between MRI and DSA, mean ± SD	30 ± 24.2
By hemisphere (n=46)
Clinical data
	Symptomatic	28 (60.9%)
	Prior contralateral revascularization	4 (8.7%)
	Infarct:
	No prior infarct	16 (34.8%)
	Prior infarct	30 (65.2%)
	CVR:
	Normal/increased	11 (23.9%)
	Decreased	35 (76.1%)
	mSS:
	0	3 (6.5%)
	I	5 (10.9%)
	II	20 (43.5%)
	III	14 (30.4%)
	IV	4 (8.7%)
	Number of collaterals impaired:
	0	10 (21.7%)
	1	1 (2.2%)
	2	6 (13.0%)
	3	10 (21.7%)
	4	10 (21.7%)
	5	3 (6.5%)
	6	3 (6.5%)
	7	3 (6.5%)
	PIRAMD grade
	1	8 (17.4%)
	2	18 (39.1%)
	3	20 (43.5%)