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Table 2: Frequency of flow signal in PP/EV and IPS by age group and grading
Age Group (y) Grade I or II Grade III or IV
PP/EV (%) IPS (%) PP/EV+IPS (%) PP/EV (%) IPS (%) PP/EV+IPS (%)
0–9 (n=2) 0 (0) 0 (0) 0 (0) 0 (0) 0 (0) 0 (0)
10–19 (n=12) 3 (25.0) 1 (8.3) 0 (0) 0 (0) 0 (0) 0 (0)
20–29 (n=11) 3 (27.3) 2 (18.2) 0 (0) 0 (0) 0 (0) 0 (0)
30–39 (n=23) 4 (17.4) 1 (4.3) 0 (0) 2 (8.7) 0 (0) 0 (0)
40–49 (n=25) 4 (16) 1 (4) 1 (4) 1 (4) 0 (0) 0 (0)
50–59 (n=59) 14 (23.7) 12 (20.3) 2 (3.4) 7 (11.9) 2 (3.4) 2 (3.4)
60–69 (n=97) 11 (11.3) 9 (9.3) 2 (2.1) 13 (13.4) 0 (0) 3 (3.1)
70–79 (n=128) 23 (18.0) 18 (14.1) 1 (0.8) 13 (10.2) 4 (3.1) 5 (3.9)
80–89 (n=49) 10 (20.4) 18 (36.7) 2 (4.1) 10 (20.4) 2 (4.1) 4 (8.2)
Total (n=406) 72 (17.7) 62 (15.3) 8 (2.0) 46 (11.3) 8 (2.0) 14 (3.4)
Note:—Data represent the numbers of cases. EV indicates emissary vein; IPS, inferior petrosal sinus; PP, pterygoid plexus.