Table 5.

Comparison of the Proportions of Patients Who Had Lower Mean Nocturnal Baseline Impedance Values Than the Cutoff With Both Methods in Gastroesophageal Reflux Disease and Non-gastroesophageal Reflux Disease Groups

Group	MNBI value at 5 cm above the LES			MNBI value at 3 cm above the LES
	Simple	Conventional	P-value	Simple	Conventional	P-value
Cutoff value	2034	1943		1785	1784
Non-GERD (FH + RH)	6/40	4/40	0.737	4/40	4/40	1
GERD (ERD + NERD)	32/40	32/40	1	32/40	33/40	1

MNBI, mean nocturnal baseline impedance; LES, lower esophageal sphincter; GERD, gastroesophageal reflux disease; FH, functional heart burn; RH, reflux hypersensitivity; ERD, erosive reflux disease; NERD, non-erosive reflux disease.