1. Volume 142, Issue 4, Pages 744-753 (April 2012)
Cigarette Smoking Increases Risk of Barrett's Esophagus: An Analysis of the Barrett's and Esophageal Adenocarcinoma Consortium 
Michael B. Cook, Nicholas J. Shaheen, Lesley A. Anderson, Carol Giffen, Wong–Ho Chow, Thomas L. Vaughan, David C. Whiteman, Douglas A. Corley 
Gastroenterology 
Volume 142, Issue 4, Pages (April 2012)
DOI: /j.gastro
Copyright © 2012 AGA Institute Terms and Conditions

2. Figure 1
Forest plots of the relationship between increasing categories of cigarette smoking and Barrett's esophagus compared with (A) population-based controls and (B) GERD controls. Each study's estimate is represented by the corresponding black square with the arms representing 95% CIs. The gray box overlaying each estimate represents the weight that it contributes to the pooled estimate. The pooled estimates are designated by the diamonds that follow each subgroup; the widths of the diamonds represent the 95% CIs. KPNC, Kaiser Permanente Northern California; UNC, University of North Carolina.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2012 AGA Institute Terms and Conditions

3. Figure 2
Spline plots of the relationship between increasing categories of cigarette smoking and Barrett's esophagus compared with (A) population-based controls and (B) GERD controls. The solid line represents the estimate of the OR, and the broken lines on either side represent 95% CIs.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2012 AGA Institute Terms and Conditions