Table IV.
Changes in 24 h esophageal pH indexes in RE group and NERD group.
| Group | n | DeMeester score (points) | Longest time of reflux (min) | Severe acid exposure ratio [n (%)] | Total times of reflux |
|---|---|---|---|---|---|
| NERD | 12 | 42.3±9.9 | 15.9±4.9 | 2 (16.6) | 2.38±1.17 |
| Grade I RE | 15 | 44.9±9.1 | 20.2±6.1 | 3 (20.0) | 3.22±1.49 |
| Grade II RE | 18 | 58.6±10.2a | 24.6±5.5a | 5 (27.7) | 4.38±1.55a |
| Grade III RE | 15 | 70.7±12.5a,b | 33.5±7.2a,b | 8 (53.3)a,b | 6.12±1.67a,b |
a
P<0.05 vs. NERD group
b
P<0.05 vs. grade II RE group. RE, reflux esophagitis; NERD, non-erosive reflux disease.