Table 3. Eating, drinking, and smoking habits as potential risk factors for GERD symptoms.

Risk factors		OR	95% CI	p-value
Univariate logistic regression analysis
	Drinking coffee in the past 1 wk	0.83	0.38–1.80	0.641
	Eating chocolate in the past 1 wk	1.00	Cannot be calculated*
	Drinking soda in the past 1 wk	2.53	0.97–6.56	0.056
	Smoking in the past 1 wk	1.70	0.19–14.82	0.633
	Eating spicy foods in the past 1 wk	1.20	0.27–5.29	0.811
	Eating sour foods in the past 1 wk	2.11	0.73–6.06	0.167
Multivariate logistic regression analysis
	Drinking soda in the past 1 wk	2.29	0.87–6.03	0.094
	Eating sour foods in the past 1 wk	1.74	0.59–5.09	0.315

GERD: gastroesophageal reflux disease, OR: odds ratio, CI: confidence interval.

^*Cannot be calculated because all of the subjects with GERD had homogenous characteristics.