Fig. 6

Heatmap for the general population: Relationship between objective comprehension and usefulness. The X axis represents the level of objective comprehension, i.e. number of correctly answered questions. The Y axis represents the level of perceived usefulness of the format to understand the information. V: Cramer’s V strength of association. Levels of significance: *** p < 0.001; ** p < 0.01; * p < 0.05