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. 2021 Sep 24;89(6):1071–1079. doi: 10.1093/neuros/nyab354

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© Congress of Neurological Surgeons 2021.

This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

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FIGURE 2. — ROC curve for admission SII index to identify patients with cerebral vasospasm. ROC analysis was performed to determine the association of SII index with the development of delayed cerebral vasospasm. SII index is compared to modified Fisher scale, a measure routinely used in clinical practice to predict vasospasm. Predicted probabilities from the multivariable logistic model, whereby SII was adjusted by age, aneurysm location, diabetes mellitus, hyperlipidemia, and modified Fisher scale, were also plotted. Adjusted SII identified patients at risk of vasospasm (AUC = 0.767, P < .001). The optimal predictive cut-off value for adjusted SII from the multivariable model's predicted probabilities based on Youden's index was a 0.764, corresponding to a sensitivity of 54.6% and specificity of 87.0%.