Background: Previous epidemiologic studies have identified an association between diabetes mellitus (DM) and the prevalence of GERD. Purported mechanisms include delayed gastric emptying and/or disordered esophageal motility due to autonomic neuropathy. A recognized confounder is obesity. Our purpose was to determine whether there is an independent association between DM and GERD after adjusting for potential confounders in a populationbased cohort of urban African Americans (AA's). Methods: TRIAGE (Temple Registry for Investigation of African American Gastrointestinal Disease Epidemiology) is an ongoing NIHfunded registry of AA's from a single zip code tabulation area in North Philadelphia. Using geographical mapping, complex sampling of the community was performed. Weighted data is in close agreement with published census and demographic data (e.g. age and gender prevalence, education level, median income) for the area. All participants completed a validated, computer-based interview assisted by a research coordinator. GERD was defined as heartburn and/or regurgitation .= 3 days/wk or a physician visit for treatment of GERD in the past year. All participants underwent measurement of height, weight, and hip/waist circumference. All subjects with DM completed the Diabetes Complications Index (DCI scored 0-6) and recorded the duration of DM, fasting blood sugar, and latest HgbA1C. Results: We interviewed 419 subjects corresponding to a weighted population of N = 21,264; 56.9% female, mean age 44.2 ± 2.1 y. Prevalence of GERD = 23.7% , and DM = 14.9%. The prevalence of GERD for individuals with and without DM was 41.5 vs. 20.6% ;P , 0.001. Logistic regression identified DM (adjusted OR = 2.38; 2.18-2.59), Age . 40 (1.25;1.17-1.35), BMI . 30 (1.49;1.37-1.62), harmful drinking (1.58;1.44-1.75), and high smoking dependence (2.11;1.83-2.43) as independent risks for GERD. We substituted waist; hip ratio for BMI but this had little impact on adjusted risk. Gender was an important effect modifier. In males, after imputation of the same co-variables, the risk of GERD in those with DM was substantial (OR=4.63;3.96-5.40) while in females the risk was significant but far less (1.79;1.61-2.00). We found no relationship between the number of years of DM, the patient's fasting glucose, or score on the DCI. Conclusions: In our African American registry, we found a high prevalence of GERD and confirmed that DM was an important, independent risk factor. This effect was most pronounced in males. There was no evidence that duration of DM, glucose control, or autonomic dysfunction modified this relationship. Future studies focused on the mechanism of this relationship are needed.
Read full abstract