1. The Association Between Diabetes and Hepatocellular Carcinoma: A Systematic Review of Epidemiologic Evidence 
Hashem B. El–Serag, Howard Hampel, Fariba Javadi 
Clinical Gastroenterology and Hepatology 
Volume 4, Issue 3, Pages (March 2006)
DOI: /j.cgh
Copyright © 2006 American Gastroenterological Association Institute Terms and Conditions

2. Figure 1
Unadjusted ORs and 95% CIs for the association between diabetes and HCC in 13 case-control studies. *Population-based control groups, **hospital-based control groups. , weighted average of all studies. Black boxes indicate point estimates for ORs.
Clinical Gastroenterology and Hepatology 2006 4, DOI: ( /j.cgh )
Copyright © 2006 American Gastroenterological Association Institute Terms and Conditions

3. Figure 2
Unadjusted risk ratios and 95% CIs for the association between diabetes and HCC in 12 cohort studies. , weighted average of all studies. Black boxes indicate the point estimates for risk ratios.
Clinical Gastroenterology and Hepatology 2006 4, DOI: ( /j.cgh )
Copyright © 2006 American Gastroenterological Association Institute Terms and Conditions

4. Figure 3
Pooled risk estimates and 95% CIs of studies grouped according to study design, geographic location, and control group selection. df, degrees of freedom.
Clinical Gastroenterology and Hepatology 2006 4, DOI: ( /j.cgh )
Copyright © 2006 American Gastroenterological Association Institute Terms and Conditions

5. Figure 4
A funnel plot showing the relationship between the precision of risk estimates (a function of sample size) on the y-axis, and the log of risk estimates on the x-axis. Each circle (○) represents 1 study. The distribution is relatively symmetric, indicating the absence of publication bias.
Clinical Gastroenterology and Hepatology 2006 4, DOI: ( /j.cgh )
Copyright © 2006 American Gastroenterological Association Institute Terms and Conditions