Anatomic and clinical characteristics
| Demographic Characteristic | Platelet Testing/PED Group | PED Alone Group | P Value |
|---|---|---|---|
| No. (%) of patients | 511 (73.2) | 187 (26.8) | |
| Age, y | |||
| Mean ± SD | 58.1 ± 14.1 | 55.7 ± 13.2 | .022 |
| Median (minimum, maximum) | 59 (9, 86) | 57 (13, 81) | |
| No. (%) male | 98 (19.2) | 40 (21.4) | .52 |
| Follow-up duration, mo | |||
| Mean ± SD | 21.5 ± 8.0 | 23.5 ± 10.1 | .20 |
| Median (minimum, maximum) | 20.8 (0.1, 48.0) | 21.3 (0.2, 60.5) | |
| Total no. (%) of aneurysms | 601 (74.8) | 201 (25.2) | |
| No. (%) of patients with | |||
| 1 aneurysm | 438 (85.7) | 176 (94.1) | |
| 2 aneurysms | 61 (11.9) | 9 (4.8) | .008 |
| ≥3 aneurysms | 12 (2.4) | 2 (1.1) | |
| Mean center volume ± SD, n | 65 ± 45 | 63 ± 32 | .06 |
| Median center volume (minimum, maximum), n | 47 (21, 149) | 69 (19, 149) | |
| Mean practitioner volume ± SD, n | 25 ± 15 | 21 ± 13 | .004 |
| Median practitioner volume (minimum, maximum), n | 21 (1, 54) | 21 (1, 54) | |
| Aneurysm size, mm | |||
| Mean ± SD (n) | 10.8 ± 7.7 (595) | 12.0 ± 7.7 (200) | .01 |
| Median (minimum, maximum) | 8.8 (1.0, 55.0) | 10.5 (1.0, 40.0) | |
| Aneurysm location, % (n/N) | |||
| Internal carotid artery | 78.0 (469/601) | 77.1 (155/201) | |
| Middle cerebral artery | 4.7 (28/601) | 3.0 (6/201) | |
| Posterior cerebral artery | 1.7 (10/601) | 1.0 (2/201) | .11 |
| Basilar artery | 4.0 (24/601) | 8.5 (17/201) | |
| Other | 11.6 (70/601) | 10.4 (21/201) | |
| Multiple PEDs used | 38.0 (227/598) | 27.9 (56/201) | .01 |
| Aneurysm shape, % (n/N) | |||
| Saccular | 76.9 (462/601) | 77.1 (155/201) | |
| Fusiform | 13.1 (79/601) | 13.4 (27/201) | .58 |
| Dissecting | 5.0 (30/601) | 6.5 (13/201) | |
| Other | 5.0 (30/601) | 3.0 (6/201) |