Table 3. Results of ambulatory pH testing before and after LINX implantation.

Characteristic	Pre-LINX (N)	Post-LINX (N)	Pre-LINX	Post-LINX	Median∆	P value
Total distal acid contact time (%)	17	8	7.60 [6.30, 13.2]	10.5 [2.28, 13.7]	+1.15	0.5
Normal total distal acid contact timea	17	8	1 (5.9%)	3 (37.5%)		0.16
DeMeester score	17	8	32.3 [23.6, 52.6]	39.2 [9.55, 54.1]	+0.55	0.3
Normal DeMeester scoreb	17	8	2 (11.8%)	3 (37.5%)		0.6

Continuous variables presented as median (interquartile range). ^a, normal total distal acid contact time <4.2%; ^b, normal DeMeester score is test dependent. Patient scores were evaluated based on the normal range for each individual test (dual probe pH test vs. pH test with impedance). Median∆, median change post-LINX implantation (compared to pre-LINX measurements). LINX, LINX Reflux Management System.