Figure 5.

A comparative prevalence of rumination syndrome using different versions of ROME criteria in our sample.

Notes: (i) The frequency of rumination is defined as 2–3/month in ROME III and 1/week in ROME IV. (ii) The exact wording of food regurgitation is slightly different between different versions, and ROME IV uniquely includes re-swallowing without necessarily rechewing or spitting out (1, 4, 68). (iii): In our study, we have asked if the regurgitant is sour, in ROME II the question is “does it stop when it becomes sour”.