H Yamauchi, T Higashi, S Kagawa et al. Impaired perfusion modifies the relationship between blood pressure and stroke risk in major cerebral artery disease. J Neurol Neurosurg Psychiatry 2013;84:1226–1232. In table 3 of this article the number of the patients with decreased CBF/CBV and SBP>170 should be 1 and not 16.