Table 1.

Summary of pH and multiple intraluminal impedance results before and after percutaneous endoscopic gastrostomy placement

Parameter	Pre-PEG	Post-PEG	P-value
Total GOR events	183	355
Median	17.50	39.50	0.047
Range	2-54	3-63
Total number of GOR events reaching uppermost channel 1	103	290
Median	9.00	27.00	0.022
Range	1-29	1-55
Total non-acid GOR events	156	182
Median	13.00	18.00	0.610
Range	2-49	3-38
Total acid GOR events	27	173
Median	1.00	13.00	0.028
Range	0-11	0-50
Bolus clearance time (s)
Median	13.45	13.00	0.445
Range	9-20	9-19
Height (channel)
Median	1.50	1.50	0.172
Range	1-3	1-2
Proximal pH
Median	5.70	5.15	0.058
Range	5-7	4-6
Distal pH
Median	5.30	4.20	0.050
Range	4-6	4-5
Proximal acid clearance time (s)
Median	17.00	20.10	0.715
Range	2-320	12-33
Distal acid clearance time (s)
Median	38.70	39.50	0.500
Range	10-130	26-92
Proximal reflux index (%)
Median	0.15	0.70	0.092
Range	0-0	0-11
Distal reflux index (%)
Median	0.25	2.95	0.032
Range	0-2	0-40

GOR: Gastro-oesophageal reflux; PEG: Percutaneous endoscopic gastrostomy.