Gender differences in the time-course changes of reflux esophagitis in Japanese patients.

OBJECTIVE: Obesity is related to an increased prevalence of reflux esophagitis and gastroesophageal reflux disease symptoms. This study was performed to clarify the influence of gender on time-course changes in the rate of a high BMI and incidence of reflux esophagitis in Japanese subjects. METHODS: The subjects included individuals who visited a medical center for medical checkups between April 2000 and March 2001, April 2005 and March 2006 and April 2010 and March 2011. At each examination, the subjects underwent upper gastrointestinal endoscopy to determine the presence of reflux esophagitis, size of the diaphragmatic hiatus and degree of gastric mucosal atrophy. A body mass index (BMI) of ≥ 25 kg/m(2) was defined as a high BMI. RESULTS: A multiple logistic regression analysis showed that a high BMI, milder degree of gastric mucosal atrophy and larger size of diaphragmatic hiatus were significant predictive factors for the presence of reflux esophagitis in both men and women. The number of male subjects with reflux esophagitis and a high BMI increased during the 10-year examination period. In contrast, the number of individuals with reflux esophagitis and a high BMI was not increased among women. For both men and women, the proportions of patients with a large diaphragmatic hiatus and mild gastric mucosal atrophy increased during the 10-year period. CONCLUSION: The prevalence of reflux esophagitis in the female subjects remained constant over 10 years, different from that observed in the men. A lack of change in BMI may be an important factor accounting for the constant prevalence of reflux esophagitis in women.