1. Coffee Consumption and Risk of Liver Cancer: A Meta-Analysis
Susanna C. Larsson, Alicja Wolk 
Gastroenterology 
Volume 132, Issue 5, Pages (May 2007)
DOI: /j.gastro
Copyright © 2007 AGA Institute Terms and Conditions

2. Figure 1
Relative risks of liver cancer associated with coffee consumption (per 2 cups/day increment). Squares represent study-specific relative risk estimates (size of the square reflects the study-specific statistical weight, that is, the inverse of the variance); horizontal lines represent 95% CIs; diamonds represent summary relative risk estimates with corresponding 95% CIs. Tests for heterogeneity: all studies, Q = 11.56; P = .17; I2 = 30.8%; cohort studies, Q = 1.74; P = .63; I2 = 0%; case–control studies, Q = 9.28; P = .05; I2 = 36.9%.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2007 AGA Institute Terms and Conditions

3. Figure 2
Relative risks of liver cancer associated with coffee consumption (per 2 cups/day increment), stratified by history of liver disease. Squares represent study-specific relative risk estimates (size of the square reflects the study-specific statistical weight, that is, the inverse of the variance); horizontal lines represent 95% CIs; diamonds represent summary relative risk estimates with corresponding 95% CIs. Tests for heterogeneity: without a history of liver disease, Q = 4.58; P = .21; I2 = 34.6%; with a history of liver disease, Q = 7.00; P = .07; I2 = 57.1%.
Gastroenterology  , DOI: ( /j.gastro )
Copyright © 2007 AGA Institute Terms and Conditions