Demographics, Socioeconomic Measures, Comorbid Conditions and Treatment Allocation for Patients with Subarachnoid Hemorrhage.

Abbreviations: SE, standard error.
aAll values were estimated to yield nationally representative estimates for the U.S. population (see Methods).
bP<0.001 when comparing difference between groups using the Wald chi-square test for categorical variables and analysis of variance for continuous variables.