Table 3 Comparison of impedance findings between the present study in patients with gastro-oesophageal reflux symptoms and previous analyses in asymptomatic patients. The ideal cut-off points for impedance as measured by the present study fall below the conventional cut-offs as determined by the 95th percentile of asymptomatic patients [12, 20]

From: Optimization of impedance-measured reflux events in GORD utilizing acid exposure time