Stratified analyses between <i>CTLA4</i> -1722T/C (rs733618) polymorphism and ESCC risk by sex, age, smoking status and alcohol consumption.

a<p>The genotyping was successful in 611 (97.1%) ESCC cases, and 657 (95.8%) controls for <i>CTLA4</i> -1722T/C (rs733618);</p>b<p>Adjusted for age, sex, smoking status and alcohol consumption (besides stratified factors accordingly) in a logistic regression model.