TABLE 2.
Characteristics of the Cohort Overall and by Aneurysm Status, n = 550
| Complete cohort | Nonaneurysmal SAH | Aneurysmal SAH | P value | |
|---|---|---|---|---|
| Number of patients | 550 | 106 | 444 | |
| Age, mean ± SD | 55.0 ± 13.0 | 55.8 ± 10.7 | 54.8 ± 13.4 | .4* |
| Female sex | 362 (66%) | 47 (44%) | 315 (71%) | <.001‡ |
| Modified Fisher | .006‡ | |||
| 1 | 39 (7%) | 2 (2%) | 37 (8%) | |
| 2 | 32 (6%) | 6 (7%) | 26 (6%) | |
| 3 | 162 (29%) | 44 (42%) | 118 (27%) | |
| 4 | 317 (58%) | 54 (51%) | 263 (59%) | |
| Hijdra score, median (IQR) | ||||
| SAH | 20.0 (10.5-25.0) | 10.5 (5.0-17.0) | 21.5 (13.0-25.5) | <.001** |
| IVH | 2.0 (0.5-2.5) | 1.5 (0-2.0) | 2.0 (0.5-3.0) | .006** |
| Sum | 22.0 (12.5-27.5) | 12.5 (5.5-20.0) | 23.5 (14.5-38.0) | <.001** |
| Diffuse SAH pattern on CT | 43 (8%) | 7 (2%) | 36 (34%) | <.001‡ |
| ICH | 91 (17%) | 0 (0%) | 91 (21%) | <.001‡ |
| WFNS ≥ 3 | 193 (35%) | 13 (12%) | 180 (41%) | <.001‡ |
| CSF diversion on admission | 357 (65%) | 39 (37%) | 318 (72%) | <.001‡ |
| Current or former tobacco user | 273 (54%) | 39 (38%) | 234 (53%) | .001‡ |
Bivariate analysis demonstrated significant differences (P < .05) in the proportion of female patients in each group, modified Fisher scale, diffuse hemorrhage pattern, presence of ICH, need for CSF diversion, and smoking history. Patients also varied significantly between groups in the amount of blood measured by the Hijdra component and sum scores. Variables are shown as either number and percentage or average +/– standard deviation. Statistical comparisons are via Student's t-test (**) or chi-squared test (‡) as appropriate.