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Table 1 Operationalising the diagnosis of Gastroesophageal reflux disease (GERD), Functional dyspepsia (FD), and Irritable bowel syndrome (IBS) in terms used in the survey

From: Self-rated health and functional capacity in individuals reporting overlapping symptoms of gastroesophageal reflux disease, functional dyspepsia and irritable bowel syndrome - a population based study

GERD
 A condition that develops when reflux of the stomach contents causes troublesome symptoms and/or complications. Must include at least one of the two criteria:
  • Mild symptoms occurring more than 1 day a week or moderate to severe symptoms at least once a week.
  • Impaired sleep at least to some extent, or impaired daily activities at least to a lesser extent and mild symptoms occurring at least once a week, or moderate to severe symptoms at least 2–3 times a month.
FD
 Must include one or more of the following:
  • Uncomfortably full after a regular-sized meal more than 1 day/week in the last 3 months. Onset more than 6 months ago.
  • Unable to finish a regular-sized meal more than 1 day/week in the last 3 months. Onset more than 6 months ago.
  • Pain or burning in the middle of the abdomen at least 1 day/week in the last 3 months. Onset more than 6 months ago.
IBS
 Must include:
 Pain or discomfort in the abdomen at least 2 to 3 days/month in the last 3 months with onset at least 6 months ago. For women, the pain must not occur only during menstrual bleeding. And at least 2 of the 3 following criteria:
  • Pain or discomfort gets better after bowel movements at least sometimes.
  • Onset of pain or discomfort associated with more frequent stools at least sometimes or onset of pain, or discomfort associated with fewer stools at least sometimes.
  • Onset of pain or discomfort associated with loose stools at least sometimes, or onset of pain or discomfort associated with hard stools at least sometimes.