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.