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Objective: To analyze the Barrow Neurological Institute (BNI) grading scale, a quantitative scale measuring maximal subarachnoid hemorrhage thickness on axial computed tomography, on delayed cerebral ischemia (DCI) and outcome (modified Rankin scale; mRS) at discharge and 1-year follow-up (1FU) in patients with aneurysmal subarachnoid hemorrhage (aSAH) from a nationwide SAH registry. Methods All patient data was obtained from the Swiss nationwide multicentre registry database of aSAH (Swiss SOS). In 1321 patients demographic data, BNI scale, DCI and mRS up to the 1FU were available for descriptive and univariate statistics. Outcome was dichotomized in favorable (mRS 0-2) and unfavorable (mRS 3-6). Odds ratios (OR) for DCI of Fisher 3 patients (n=1115, 84%) compared to a control cohort of Fisher grade 1,2 and 4 patients (n=206, 16%) were calculated for each BNI grade separately. Results Overall, 409 patients (31 %) developed DCI with a high DCI rate in the Fisher 3 cohort (34%). For what concerns the BNI scale, DCI rates went up progressively from 26% (BNI 2) to 38% (BNI 5