Mean (SD) pH increment in response only to peristaltic activity, and comparison among the three groups
| pH (unit) | Comparison | 95% CI9-150 | p Value | |
| Group 1 | 0.99 (0.88) | Group 1–group 2 | 0.44 to 0.61 | p<0.05 |
| Group 2 | 0.46 (0.63) | Group 1–group 3 | 0.41 to 0.59 | p<0.05 |
| Group 3 | 0.49 (0.58) | Group 2–group 3 | −0.11 to 0.05 | p>0.05 |
↵9-150 The 95% confidence interval (CI) shows that it is 95% confidence that the differences of means between group 1 and group 2, group 1 and group 3, and group 2 and group 3 lie between 0.44 and 0.61, 0.41 and 0.59, and −0.11 and 0.05, respectively, for overall pH increment in response to peristaltic activity during the total period.