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

Table 3 Prevalence of additional symptoms according to symptom frequency

(χ2)	Frequent	Occasional	None
NCCP (179)	35.9%ac	30.2%a	13.7%
Dysphagia (230)	24.5%a	18.6%a	4.6%
Belching (221)	36.8%a	28.3%	11.9%
Nausea (601)	29.7%a	10.6%	3.4%
Vomiting (417)	15.7%a	3.4%	0.9%
Hematemesis (33)	2.6%a	1.4%	0.2%
Hiccup (68)	6.4%a	7.0%a	1.2%
Cough (70)	16.3%a	11.7%	5.9%
Asthma (24)	8.2%a	3.8%	3.7%
Hoarseness (48)	6.2%a	4.0%	1.3%
Chronic pharyngitis (32)	8.4%a	7.2%a	3.3%

^aP < 0.05 vs subjects without symptoms;

^cP < 0.05 vs subjects with occasional symptoms. NCCP: Noncardiac chest pain.