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Table 3 GER positive pH data by clinical groups

From: Do gastrointestinal and respiratory signs and symptoms correlate with the severity of gastroesophageal reflux?

pH metry parameter Group 1 gastrointestinal median (min max) Group 2 respiratory median (min- max) Group 3 mixed median (min-max) P
Number of reflux episodes greater than 5 minutes in 24 2 (1-21) 3 (0-22) 2.5 (2-9) 0.682
Number of reflux episodes in 24 hours 74 (40-426) 61.5 (20-271) 92 (74-197) 0.286
Duration of the longest reflux episode 20 (10-260) 23 (10-146 24 (7-29) 0.919
The reflux index 8 (4-77.8) 7.8 (5-65) 10.3 (7.8-16) 0.576
Fraction of time with pH lower than 4 pH > 5 (%) 2.7 (0-6) 2 (0-10.9) 6 (4.7-11.5) 0.004