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Interaction tree generated by supervised cluster analysis. This picture illustrates the process of interaction tree model. Group C was first split out, which showed the heterogeneity between group C and the rest in aspects of tPA effects on sICH. Then group A and group B were separated. NIHSS, National Institutes of Health Stroke Scale; sICH, symptomatic intracranial haemorrhage; tPA, tissue plasminogen activator.
