Ultrasonographic study of postcibal gastro-esophageal reflux and gastric emptying in infants with recurrent respiratory disease

Table 2 Ultrasonographic characteristics of gastro-esophageal reflux in infants with recurrent respiratory diseases and in healthy controls

	Patients	Controls	P
Number of reflux episodes	10 (2-21)	3 (1-9)	<0.01
Reflux frequency (reflux episodes/min)	0.5 (0.1-1.05)	0.15 (0.05-0.45)	<0.01
Maximal esophageal lumen enlargement (mm)	5 (1-17)	1.5 (1-9)	<0.01
Duration of the longest reflux episode (s)	11 (2-18)	4 (2-12)	<0.01

Results are expressed as median (range). Differences between groups were tested using Mann-Whitney U test.