Prevalence of gastroesophageal reflux disease in a country with a high occurrence of Helicobacter pylori

Table 4 Prevalence of additional symptoms in studies using the Mayo questionnaire

	Olmsted (United States)[1]	Turkey	Moscow (Russia)[17]	Argentina[18]	North West China[8]
NCCP	23.1	35.9	15.5	37.6	34.7
Dysphagia	13.5	24.5	25.5	26.8	6.5
Odynophagia	-	-	34.4	-	10.7
Globus	7.0	23.8	25.5	26.3	15.2
Dyspepsia	10.6	-	60.2	38.7	29.3
Belching	-	36.8	43.0	-	-
Nausea	-	29.7	53.8	-	-
Vomiting	-	15.7	29.1	-	-
Hiccup	-	6.4	6.8	-	-
Cough	-	16.3	36.7	-	8.9
Asthma	9.3	8.2	-	6.7	4.2
Pharyngeal symptoms and Hoarseness	14.3	7.3	10.4	21.8	9.4

NCCP: Noncardiac chest pain.