TABLE 3.
Risk factors for multiple IAs
| Factor | FIA | ISUIA | p Value |
|---|---|---|---|
| no. of pts | 182 | 674 | |
| mean age in yrs at study entry | 56.4 ± 11.5 | 55.6 ± 11.7 | 0.412 |
| no. of women (%) | 160 (87.9) | 531 (78.8) | 0.006 |
| no. white, non-Hispanic pts (%) | 154 (84.6) | 617 (91.5) | 0.006 |
| total no. of unruptured IAs | 462 | 1637 | |
| location of largest IA (%) | 0.473 | ||
| ICA, cavernous ICA, OA | 73 (40.1) | 269 (39.9) | |
| ACoA, ACA | 17 (9.3) | 74 (11.0) | |
| MCA | 53 (29.1) | 183 (27.2) | |
| PCoA | 19 (10.4) | 82 (12.2) | |
| BA tip | 11 (6.0) | 50 (7.4) | |
| VBA (other than BA tip) | 9 (4.9) | 16 (2.4) | |
| no. w/ history of hypertension (%) | 102 (56.0) | 269 (39.9) | <0.001 |
| cigarette smoking (%) | 0.002 | ||
| never smoked | 28 (15.4) | 129 (19.1) | |
| former smoker | 91 (50.0) | 234 (34.7) | |
| current smoker | 63 (34.6) | 308 (45.7) | |
| unknown | 0 (0.0) | 3 (0.5) | |
| alcoholic drinks, avg no./day (%) | <0.001 | ||
| never drinks | 109 (59.9) | 262 (38.9) | |
| <1 | 24 (13.2) | 261 (38.7) | |
| 1–2 | 37 (20.3) | 95 (14.1) | |
| 3–5 | 4 (2.2) | 37 (5.5) | |
| 6–8 | 2 (1.1) | 9 (1.3) | |
| ≥9 | 5 (2.7) | 5 (0.7) | |
| unknown | 1 (0.5) | 5 (0.7) | |
| caffeine drinks, avg no./day (%) | <0.001 | ||
| none | 13 (7.1) | 81 (12.0) | |
| <1 | 8 (4.4) | 125 (18.6) | |
| 1–2 | 44 (24.2) | 192 (28.5) | |
| 3–4 | 48 (26.4) | 182 (27.0) | |
| ≥5 | 69 (37.9) | 91 (13.5) | |
| unknown | 0 (0.0) | 3 (0.5) |