Gastro-oesophageal reflux indices
| Study population | Patients studied on PPI | |
| Subjects n | 45 | 18 |
| Oesophageal acid exposure % | 3.1 (1.0–6.4) | 0.5 (0.1–2.3) |
| Oesophageal volume exposure % | 0.7 (0.3–1.4) | 0.75 (0.4–1.4) |
| Total number of reflux events 24 h−1 | 33 (17–49) | 34 (18–52) |
| Acid reflux events n | 16 (7–26) | 2 (0–8) |
| Nonacid reflux events n | 15 (6–20) | 26 (18–45) |
| Proximal extent of reflux at 15 cm# | 9 (3–19) | 13 (2–17) |
Data are presented as median (25th–75th percentile), unless otherwise indicated. PPI: proton pump inhibitor. #: i.e. reflux events >15 cm.