24-hour esophageal pH-monitoring in children suspected of gastroesophageal reflux disease: Analysis of intraesophageal pH monitoring values recorded in distal and proximal channel at diagnosis

Table 2 Statistically analysis of selected parameters of 24-h pH-monitoring in 264 children suspected of GERD; pH-monitoring with 1- or 2- channel probe

Groups of examined children with specific ailment	pH-monitoring parameters-distal channelrange of values; mean; standard deviation (± SD); median; statistical significance (P)
n = 264	Number of episodes ofacid GER (pH < 4)	Number of episodes of acid GER(pH < 4), lasting > 5 min	Duration of the longestepisode of acid GER (min)	Total acid GER index (%)	Acid GER index(supine position) (%)
Statistical significance between the groups (P)
Group 2 and 3				P = 0.0001	NS
Group 2 and 4				P = 0.0001	P = 0.0001
Group 2 and 5	P = 0.0001	P = 0.0001	P = 0.0001	P = 0.0001	P = 0.0001
Group 3 and 4				P = 0.0001	P = 0.0001
Group 3 and 5				P = 0.0001	P = 0.0001
Group 4 and 5				NS	NS