Correlation between non-erosive reflux esophagitis (NERD) and selected background factors.

CI, confidence interval; H. pylori, Helicobacter pylori; PG, pepsinogen; BMI, body mass index. We evaluated age and BMI as continuous variables. Multiple logistic regression analysis was applied to calculate standardized coefficients and odds ratio for selected seven variables. The level of significance was set at p value <0.05 (†). The seven variables are shown in order of the absolute values of standardized coefficients.