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Forest plot showing modified Rankin Scale (mRS), analysed as ordinal outcome, in prespecified subgroups of participants with ischaemic stroke, with p value for interaction. Heterogeneity of the treatment effect on the primary outcome was assessed in prespecified subgroups by adding an interaction term to an adjusted ordinal logistic regression model as in figure 2. FAST, Face-Arm-Speech-Time; GTN, glyceryl trinitrate; BP, blood pressure.
