Day-to-day reproducibility of gastric emptying at 1 hour (top left), 2 (top right), 4 hours (bottom left) and gastric emptying t1/2 (bottom right). Observe excellent agreement at all time points. Participants in which the overall interpretation (i.e., as normal, rapid, or delayed GE) was different between the first and second studies are depicted with filled markers. The range of normal values in the first study are depicted by the rectangular areas outlined by dotted red (in women) and blue lines (in men). During the first study, GE1 was accelerated in 14 participants, GE2 was accelerated in 13 and delayed in 8 participants, and GE4 was delayed in 16 participants