Figure 4From: 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 esophageal acidity assessed with integrated acidity and time pH < 4 in the 3rd study (n = 52 records). Data are from 24-hour esophageal recordings on the 8th day of treatment with 20 mg omeprazole or 20 mg rabeprazole. Vertical bars give the 95% confidence interval.Back to article page