Fig. 3From: Validity of a stroke severity index for administrative claims data research: a retrospective cohort studyBox-plots showing the distribution of the SSI and the NIHSS across all mRS grades at 3Â month (a), 6Â months (b), and 1Â year (c) after stroke. Abbreviations: mRS, modified Rankin Scale; NIHSS, National Institutes of Health Stroke Scale; SSI, stroke severity indexBack to article page