Table 2 Characteristics of patients with radiation-induced intracranial aneurysms
Variables | NPC-RT | Non-NPC-RT | Non-NPC-NRT |
|---|---|---|---|
 Number | 40 | 36 | 9 |
 Incidence, 100,000 persons-year (95% CI) | 47.8 (35.1–65.2) | 23.9 (17.2–33.1) | 10.4 (5.4–19.9) |
 Interval time, years (± SD) | 4.3 (±3.1) | 1.9 (±2.2) | 5.5 (±3.2) |
 Mean age, years (± SD) | 50.7(±11.3) | 56.7 (±9.4) | 53.8 (±13.7) |
Gender | |||
 Male (%) | 31 (77.5) | 28 (77.8) | 9 (100.0) |
 Female (%) | 9 (22.5) | 8 (22.2) | 0 (0) |