Figure 1From: 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 24-hour 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