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. 2026 Apr 24;17:1801603. doi: 10.3389/fphar.2026.1801603

FIGURE 3.

Heatmap graphic visualizing phi coefficients for associations between adverse event types, grouped by system: nervous (blue), digestive (red), respiratory (green), and composite severe indicators (purple). Red cells indicate higher positive correlation, blue cells negative, and white cells no association. Cluster key and color scale included.

Co-occurrence of post-discharge adverse events. Note: Calculation of Phi (φ) coefficients for pairwise adverse event associations based on binary variables, grouped and displayed by system. Red indicates a positive correlation, blue indicates a negative correlation, and white indicates no significant correlation; color depth represents the strength of the correlation.