Prevalence of gastroesophageal reflux symptoms in a large unselected general population in Japan

Table 5 The prevalence of heartburn and dysphagia in relation to the frequency of abdominal pain

	Abdominal pain (usually)	Abdominal pain (sometimes)	No abdominal pain
n = (male/female)	(76/98)	(2344/4409)	(31 625/43 832)
Heartburn (%)
Male	47.3b	44.1b	13.8
Female	53.0b	48.0b	17.7
Dysphagia (%)
Male	28.9b	21.1b	4.1
Female	26.5b	23.2b	5.6

Chi-square test,

^bP < 0.001 vs each “no abdominal pain” group.