Air swallows, gastric belches and supragastric belches (SGBs) per 24 h
| Preoperative | Postoperative | Change (%) | p Value | |
| Air swallows (n=31) | 432 (33) | 430 (48) | −0.6 | 0.185 |
| Gastric belches (n=31) | 68.5 (4.3) | 23.9 (5.8) | −65 | <0.001 |
| SGBs not associated with reflux (n=24) | 20.8 (6.3) | 46.0 (18) | +121 | 0.036 |
| SGBs associated with reflux (n=24) | ||||
| SGBs preceding reflux episode | 5.0 (1.4) | 0.2 (0.1) | −96 | 0.001 |
| SGBs during reflux episode | 9.0 (2.3) | 0.2 (0.2) | −98 | <0.001 |