Table 1. Prevalence rates and odds ratios for esophageal cancer among sample subjects with oral cancer and comparison subjects.

Presence of esophageal cancer	Total sample N = 32,615		Subjects with oral cancer N = 2965		Comparison subjects N = 29,650
	No.	Percent (%)	No.	Percent (%)	No.	Percent (%)
Yes	77	0.24	65	2.19	12	0.04
Odds ratio a (95% confidence interval)	–		55.33*** (29.86∼102.52)		1.00

Notes: ^aThe odds ratio was calculated using the conditional logistic regression model (conditioned on age group and gender);

^*** p<0.001.