TABLE 4.
Adjusted Associations Vetween Baseline Factors and Presence of Aneurysm for Risk Score Generation, n = 550
| P value | Odds ratio (95% CI) | P value | Odds ratio (95% CI) | Final risk score | |
|---|---|---|---|---|---|
| Female sex | <.001 | 2.7 (1.6-4.6) | <.001 | 3.1 (1.9-5.3) | 1 |
| Hijdra sum score | |||||
| <22 | n/a | Reference | n/a | Reference | 0 |
| 22-27 | .002 | 3.5 (1.6-7.7) | <.001 | 4.2 (1.9-9.1) | 1 |
| >27 | .001 | 5.7 (2.1-15.3) | <.001 | 6.1 (2.5-14.8) | 2 |
| Diffuse SAH pattern on CT | <.001 | 13.4 (5.4-33.0) | <.001 | 15.3 (6.3-37.5) | 5 |
| WFNS ≥ 3 | .020 | 2.5 (1.1-5.3) | .006 | 2.6 (1.3-5.0) | 1 |
| Hydrocephalus present on admission | .3 | 1.4 (0.7-2.5) | |||
| Current or former smoker | .1 | 1.7 (1.0-2.9) |
For easier clinical application, the Hijdra sum score was mathematically partitioned, and the bivariate significance (P < .05) was again confirmed (not shown). This was entered into the nested models shown. Adjusted odds ratios were rounded to the nearest whole number and then reduced by the lowest common denominator (WFNS ≥3) to generate the final risk score associated with each factor.