Table 1: Comparison of the RE group and control group.

VariablesRE group (%)Control group (%)P
( )( )

Age (years) 0.055
mean (SD)
 20–2921 (7.8)27 (10.0)0.181
 30–3941 (15.3)47 (17.5)
 40–4954 (20.2)68 (25.3)
 50–5981 (30.2)60 (22.3)
 ≥6071 (26.5)67 (24.9)
Sex
 Men137 (51.1)131 (48.7)0.575
 Women131 (48.9)138 (51.3)
Education level
 Illiteracy21 (7.8)16 (6.0)<0.001
 Primary school
 graduate
43 (16.0)27 (10.0)
 Junior high school79 (29.5)103 (38.3)
 High school graduate74 (27.6)73 (27.1)
 College graduate21 (7.8)14 (5.2)
 Undergraduate25 (9.3)32 (11.9)
 Master graduate5 (2)4 (1.5)

Abbreviations: RE: reflux esophagitis.