Table 4.
Outcome Parameters Before and After Propensity Score Matching by Identified IBI Threshold (138.03)
| Outcome Parameters | IBI on Admission Pre-PSM (n=408) | p value | IBI on Admission Post-PSM (n=114) | p value | ||
|---|---|---|---|---|---|---|
| <138.03 | ≥138.03 | <138.03 | ≥138.03 | |||
| 349 | 59 | 57 | 57 | |||
| mRS 3–6 at 3 months, n (%) | 58 (16.6) | 30 (50.8) | <0.001 | 11 (19.3) | 28 (49.1) | 0.001 |
| Delayed cerebral ischemia, n (%) | 91 (26.1) | 25 (42.4) | 0.010 | 14 (24.6) | 23 (40.4) | 0.072 |
| Intracranial infection, n (%) | 34 (9.7) | 10 (16.9) | 0.099 | 10 (17.5) | 10 (17.5) | 1.000 |
| Hypoproteinemia, n (%) | 122 (35.0) | 25 (42.4) | 0.272 | 25 (43.9) | 24 (42.1) | 0.850 |
| Pneumonia, n (%) | 124 (35.5) | 43 (72.9) | <0.001 | 24 (42.1) | 41 (71.9) | 0.001 |
| Deep Vein Thrombosis, n (%) | 53 (15.2) | 18 (30.5) | 0.004 | 5 (8.8) | 17 (29.8) | 0.004 |
Notes: Propensity score matching (caliper 0.02, ratio 1:1, nearest neighbor approach) was performed according to the following parameters: Female, Early loss of consciousness, WFNS grade, mFS grade, GRAEB score, SEBES score, Acute hydrocephalus and surgical clipping. After PS matching, 2 evenly balanced cohorts consisting of 57 patients each and without significant differences in outcome-relevant parameters were available for further analyses. As indicated by the bold font, the p value reached statistical significance.
Abbreviations: PSM, propensity score matching IBI, inflammatory burden index; mRS, modified Rankin Scale.