1. Racial and Ethnic Variations in the Effects of Family History of Colorectal Cancer on Screening Compliance 
Molly Perencevich, Rohit P. Ojha, Ewout W. Steyerberg, Sapna Syngal 
Gastroenterology 
Volume 145, Issue 4, Pages e2 (October 2013)
DOI: /j.gastro
Copyright © 2013 AGA Institute Terms and Conditions

2. Supplementary Figure 1
Directed acyclic graph illustrating dependency assumptions for the relation between family history of colorectal cancer and colorectal cancer screening. This directed acyclic graph illustrates the assumed structure of the relation between family history of colorectal cancer and colorectal cancer screening based on existing evidence. The boxes (nodes) depict factors related to colorectal cancer screening. The arrows describe the direction of the relation between the nodes. A complete graph thus aids in the identification of potential confounding paths using the back-door test (eg, through age, which affects both family history of colorectal cancer and colorectal cancer screening). The identification of confounding paths aids in model specification for the exposure-outcome relation of interest and helps avoid overadjustment and unnecessary adjustment.
Gastroenterology  , e2DOI: ( /j.gastro )
Copyright © 2013 AGA Institute Terms and Conditions