Figure 2From: Time esophageal pH < 4 overestimates the prevalence of pathologic esophageal reflux in subjects with gastroesophageal reflux disease treated with proton pump inhibitors Prevalence of pathologic postprandial esophageal acidity assessed with integrated acidity and time pH < 4 in the index study (n = 46). The left panel gives prevalence with the 95% confidence interval. The right panel gives values for time pH < 4 from records with normal integrated acidity.Back to article page