Clinical data, imaging data and comparison of patient groups.

Data are given as median and IQR (interquartile range); Groups were compared using the Mann-Whitney U rank sum test, significant differences are marked by an asterisk; n, number; h, hours; y, years; ACA: anterior cerebral artery; MCA: middle cerebral artery; PCA: posterior cerebral artery; ICA/CCA: internal/common carotid artery; VA: vertebral artery; BA: basilar artery. a =  if patients had occlusion in two different vessels at the same time (e.g. ICA and MCA), occlusion was indicated for both vessels.