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Statistical analysis

RK Rozerin Kevci
AL Anders Lewén
ER Elisabeth Ronne-Engström
FV Fartein Velle
PE Per Enblad
TW Teodor Svedung Wettervik
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Demography, admission variables, treatments, and clinical outcome were described as numbers (proportion) for categorical data and as medians (interquartile range (IQR)) for continuous data. Differences in these variables were analyzed between the CT- and LP-verified SAH groups, using the Mann-Whitney U-test or the Pearson’s Chi-square test, depending on the type of data.

A univariate logistic regression was done to determine the odds ratio (OR) and 95% confidence interval (CI) for having a DSA-verified vascular pathology, with age, sex, WFNS grade, and time from ictus to diagnosis, respectively, as the explanatory variables, in the LP-verified SAH cohort. The Spearman rank correlation test was used to evaluate the association between GOS-E and potentially explanatory variables, including age, sex, WFNS grade, time from ictus to diagnosis, vascular pathology, length of stay in the NIC/neurointermediate care, and rebleeding in the LP-verified SAH group.

A p-value < 0.05 was considered statistically significant. All statistical analyses were conducted in software program SPSS Statistics version 27 (IBM Corp., Armonk, NY, USA).

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