Fig. 2

Heatmap (v-test score scale) of clinical and laboratory variables in each of the four clusters. A V-test score ≥ 1.96 or ≤ − 1.96 was taken as the cutoff indicating variable over- or underrepresentation in clusters. For example, in cluster 1, a first-recorded shockable rhythm was significantly overrepresented (V-test score, 33; blue color), whereas no-flow time was shorter than in the other clusters (V-test score, − 14.9; red color)