Wireless esophageal pH capsule for patients with gastroesophageal reflux disease: A multicenter clinical study

Table 2 Comparison of esophageal acid exposure measured during 24 h of simultaneous recordings in 45 patients with pH capsule (JSPH-1) and the conventional pH measurement system

Parameter	JSPH-1	MMS	P-value1
Reflux episodes (n)	17 (8-36.5)	16 (6-39.5)	0.305
Reflux episodes > 5 min (n)	0 (0-2)	1 (0-3.5)	0.058
Longest reflux time (min)	5.4 (2.1-14.2)	6.5 (1.8-15.4)	0.125
pH < 4, total time (min)	14.6 (4.0-53.8)	20 (5.6-54.1)	0.014
pH < 4, percentage of total time (%)	1.2 (0.3-4.1)2	1.5 (0.5-4.0)2	0.171

¹Wilcoxon signed rank test;

²Results are median (25^th-75^th). MMS: Measurement system.