Fig. 1

Proportional Venn diagrams and UpSet plots showing the overlap of different ME/CFS case definitions in the Dutch (a) and US (b) ME/CFS population. The different case definitions are displayed as horizontal bars on the lower left corner of the UpSet plot. Paired intersections are displayed as black dots; gray dots indicate the case definitions that are not part of the intersection. Black lines connecting 2 or more black dots indicate which case definitions form the intersections. The heights of the vertical bars indicate the intersection size (number of number of patients with indicated case definitions)