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TABLE 4: Comparison of estimates of internal carotid artery stenosis with duplex sonography versus DSA
Percentage Stenosis with Sonography Percentage Stenosis with DSA
0–29 30–69 70–99 100
0–29 56 8 — —
30–69 18 36 10 —
70–99 — 26 118 —
100 — — — 12
Note.—Numbers are pooled data (4 observers × 71 vessels = 284 evaluations).
Percentage Stenosis with Sonography	Percentage Stenosis with DSA
Percentage Stenosis with Sonography	0–29	30–69	70–99	100
0–29	56	8	—	—
30–69	18	36	10	—
70–99	—	26	118	—
100	—	—	—	12