Case fatality rates after hospital admission for stroke: Covariates were not measured

doi:10.1136/bmj.326.7398.1085-a

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Michael D Hill (michael.hill@calgaryhealthregion.ca), assistant professor

University of Calgary, Calgary Health Region, Calgary, AB, Canada T2N 2T9

EDITOR—The article by Roberts et al on stroke mortality in hospital and at one year after stroke raises several issues.1 The case-mix ratio, presence or absence of on-site neurosurgical services, and stroke unit care should be emphasised as important and easily measured explanatory covariates.

Unfortunately, the most important predictor of 30 day mortality is stroke severity at baseline, and this variable …