Fig 2. The dendrogram of the AIS patients hierarchical classification (n₀ = 103).

The Y-axis shows the Ward’s distances at which the increase in within cluster variance remains minimum after merging two groups. The number of patients in each cluster at different Ward’s distances are shown. At the highest cutoff point two clusters of G₁ = 45 patients and G₂ = 58 patients were identified. At Ward’s distance = 1700, two subgroups of G₂, G_2.1 = 11, G_2.2 = 47 were identified. At Ward’s distance = 1320, two subgroups of G₁ are shown (G_1.1 = 24, G_1.2 = 21). Finally, at Ward’s distance = 1125, G_2.2 subgroups (G_2.2.1 = 20, G_2.2.2 = 27) were shown. The two subgroups of G_1.2 (G_1.2.1 = 8, G_1.2.2 = 13), as shown at Ward’s distance = 790, were not visually different (supplementary data- S1 Fig).