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Table 2: Predictive values for cerebrovascular reserve capacity higher than 10% at different cutoff values of diameter of STA at 1 year after ECIC bypass surgery
STA Diameter (mm) Sensitivity (%) Specificity (%) Positive Likelihood Ratio Positive Predictive Value Negative Predictive Value
0.8 100 12.5 1.14 84.1 100
1.0 100 12.5 1.14 84.1 100
1.2 97.3 25.0 1.30 85.7 66.7
1.4 89.2 37.5 1.43 86.8 42.9
1.6 78.4 62.5 2.09 90.6 38.5
1.8 75.7 87.5 6.06 96.6 43.8
2.0 56.8 87.5 4.54 95.5 30.4
2.2 50.0 100 100 28.6
2.4 29.7 100 100 23.5
2.6 18.9 100 100 21.1
2.8 8.1 100 100 19.5
Note:—ECIC indicates extracranial-intracranial bypass graft.

STA Diameter (mm)	Sensitivity (%)	Specificity (%)	Positive Likelihood Ratio	Positive Predictive Value	Negative Predictive Value
0.8	100	12.5	1.14	84.1	100
1.0	100	12.5	1.14	84.1	100
1.2	97.3	25.0	1.30	85.7	66.7
1.4	89.2	37.5	1.43	86.8	42.9
1.6	78.4	62.5	2.09	90.6	38.5
1.8	75.7	87.5	6.06	96.6	43.8
2.0	56.8	87.5	4.54	95.5	30.4
2.2	50.0	100		100	28.6
2.4	29.7	100		100	23.5
2.6	18.9	100		100	21.1
2.8	8.1	100		100	19.5