Table 2.
Results of 24-h multi-channel intraluminal impedance and pH recording
| Items | NERD | RH | Independent-sample t-test or χ2test |
|---|---|---|---|
| n = 111 | n = 92 | ||
| DeMeester | 23.4 ± 13.0 | 4.0 ± 6.6 | P < 0.001 |
| Acid exposure upright (%) | 7.7 ± 6.1 | 1.4 ± 1.4 | P < 0.001 |
| Acid exposure recumbent (%) | 4.8 ± 5.0 | 0.1 ± 0.2 | P < 0.001 |
| Acid exposure total (%) | 6.1 ± 3.7 | 0.8 ± 0.8 | P < 0.001 |
| Bolus exposure upright (%) | 3.9 ± 2.8 | 2.6 ± 2.0 | P < 0.001 |
| Bolus exposure recumbent (%) | 1.2 ± 1.9 | 0.4 ± 0.7 | P < 0.001 |
| Bolus exposure total (%) | 2.5 ± 2.1 | 1.5 ± 1.1 | P < 0.001 |
| Proximal acid event (n) | 13.2 ± 10.5 | 9.7 ± 8.9 | P = 0.011 |
| Proximal nonacid event (n) | 10.1 ± 9.2 | 11.6 ± 10.7 | P = 0.284 |
| Proximal total event (n) | 23.4 ± 15.4 | 20.8 ± 16.8 | P = 0.258 |
| Distal acid reflux event (n) | 25.3 ± 15.8 | 13.4 ± 11.2 | P < 0.001 |
| Distal nonacid reflux event (n) | 19.5 ± 14.9 | 25.1 ± 15.2 | P = 0.009 |
| Distal total reflux event (n) | 44.8 ± 24.7 | 38.5 ± 20.7 | P = 0.051 |
| PSPW index (%) | 25.1 ± 9.5 | 32.6 ± 15.2 | P < 0.001 |
| MNBI (ohms) | 1450.2 ± 750.8 | 2503.6 ± 964.1 | P < 0.001 |
NERD non-erosive reflux disease, RH reflux hypersensitivity PSPW index, post-reflux swallow-induced peristaltic wave index, MNBI mean nocturnal baseline impedance