Table 3.

Correlation Between Conventional and Simple Mean Nocturnal Baseline Impedance Values in the Most Distal Channel in Each Group

Group	r-value	P-value
ERD	0.973	< 0.001
NERD	0.967	< 0.001
RH	0.842	< 0.001
FH	0.862	< 0.001
HV	0.886	< 0.001

ERD, erosive reflux disease; NERD, non-erosive reflux disease; RH, reflux hypersensitivity; FH, functional heartburn; HV, healthy volunteer.