Table 4.

Correlation Between pH-impedance Parameters and High-resolution Manometry Metrics

	AET	No. of long term acid reflux	Recumbent acid reflux	Acid reflux episodes	Weakly acid reflux episodes	Alkaline reflux episodes	SI	Distal BIL
UESP	0.226	0.123	0.374	0.243	0.207	0.197	−0.472	0.489a
PEP	−0.479a	−0.502a	−0.393	−0.219	−0.285	−0.188	0.280	0.634b
MEP	−0.451a	−0.455a	−0.370	−0.243	−0.422	−0.053	0.024	0.361
DEP	−0.366	−0.404	−0.263	−0.165	−0.389	−0.014	0.319	0.140
DCI	−0.463a	−0.475a	−0.397	−0.255	−0.438a	−0.123	0.206	0.360
LESL	−0.371	−0.579b	−0.240	−0.087	−0.13	0.198	0.544	0.395
LESP	−0.215	−0.207	−0.240	−0.123	−0.452a	−0.158	0.291	0.417a
IRP	−0.158	−0.342	−0.282	0.033	−0.612b	−0.080	0.28	0.295

AET, acid exposure time; SI, symptom index; BIL, Baseline impedance level; UESP, upper esophageal sphincter basal pressure; PEP, proximal esophageal pressure; MEP, middle esophageal pressure; DEP, distal esophageal pressure; DCI, distal contractile integral; LESL, lower esophageal sphincter length; LESP, lower esophageal sphincter basal pressure; IRP, integrated relaxation pressure.

Pearson’s correlation coefficient, r.

P-values were calculated using Pearson’s correlation analysis.

^aP < 0.05 and

^bP < 0.01 were considered statistically significant.