Investigation of relationships among gastroesophageal reflux disease subtypes using narrow band imaging magnifying endoscopy

Table 1 Demographic and clinical characteristics of gastroesophageal reflux disease patients and healthy controls n (%)

	HC	GERD
		GERD	NERD	RE	BE
Number of subjects	40	120	40	40	40
Gender (male: female)	16:24	66:54	12:28	32:8	22:18
Mean age, yr (SD)	47.7 ± 2.20	52.9 ± 1.09	52.2 ± 1.72	51.4 ± 1.73	55.1 ± 2.17
Mean BMI (SD)	22.3 ± 0.55	23.6 ± 0.36	23.5 ± 0.56	24.2 ± 0.72	23.1 ± 0.60
Mean courses, mo (SD)	-	26 ± 32.3	33 ± 5.4	24 ±4.4	21 ± 5.4
Scores of RDQ (SD)	-	16 ± 5.2	18 ± 0.8	15 ±0.7	16 ± 0.5
No. of patients with bile regurgitation	6 (15)	22 (18.3)	10 (25)	12 (30)	0 (0)
No. of patients with hiatus hernia	18 (45)	72 (60)	18 (45)	26 (65)	28 (70)

GERD: Gastroesophageal reflux disease; RE: Reflux esophagitis; BE: Barrett's esophagus; NERD: Nonerosive reflux disease; HC: Healthy controls; BMI: Body mass index; RDQ: Reflux Disease Questionnaire.