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Concordance rates in interobserver and intraobserver agreements of MRA grading in 108 cerebral hemispheres with lesions
First Review by First Observer Second Review by First Observer First Review by Second Observer
MRA Grade Number of Hemispheres MRA Grades Number of Hemispheres Concordance Rate in Intraobserver Agreement MRA Grade Number of Hemispheres Concordance Rate in Interobserver Agreement
A 59 A 59 1.00 A 59 1.00
B 0 B 0 
C 0 C 0 
D 0 D 0 
B 26 A 0 0.85 A 0 0.85
B 22 B 22 
C 4 C 4 
D 0 D 0 
C 16 A 0 0.94 A 0 0.88
B 1 B 1 
C 15 C 14 
D 0 D 1 
D 7 A 0 1.00 A 0 0.71
B 0 B 0 
C 0 C 2 
D 7 D 5 
Note:—MRA indicates MR angiography.

First Review by First Observer		Second Review by First Observer			First Review by Second Observer
MRA Grade	Number of Hemispheres	MRA Grades	Number of Hemispheres	Concordance Rate in Intraobserver Agreement	MRA Grade	Number of Hemispheres	Concordance Rate in Interobserver Agreement
A	59	A	59	1.00	A	59	1.00
		B	0		B	0
		C	0		C	0
		D	0		D	0
B	26	A	0	0.85	A	0	0.85
		B	22		B	22
		C	4		C	4
		D	0		D	0
C	16	A	0	0.94	A	0	0.88
		B	1		B	1
		C	15		C	14
		D	0		D	1
D	7	A	0	1.00	A	0	0.71
		B	0		B	0
		C	0		C	2
		D	7		D	5