Figure 8 - Duration (% time) of esophageal pH <4 in control subjects and patients with increasing severity of gastroesophageal reflux disease (GERD).
From the following article
Pathophysiology of gastroesophageal reflux disease
Nicholas E. Diamant
GI Motility online (2006)
doi:10.1038/gimo21
Acid exposure increased across groups. The horizontal dashed line represents the upper limits of normal acid reflux. (Source: Adapted from Vaezi, Richter,5 with permission from American Gastroenterological Association)
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