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Table 2 Characteristics of cohort studies of hepatitis viruses infection and ICC risk

From: Hepatitis viruses infection and risk of intrahepatic cholangiocarcinoma: evidence from a meta-analysis

First author Year Country Source Sample size Mean follow-up
(years)
ICC Hazard ratio 95% CI Study ,
quality
Tanaka 2009 Japan Voluntary blood donors 2519 (HBsAg +) 7.6 2 8.56 (1.33-55.2) 3
1927 (anti-HCV+) 1 2.63 (.25-27.73)
150368 (all negative) 8  
El-Serag 2009 US Veterans population 146394 (anti-HCV+) 2.3 14 2.6 (1.3-5.0) 2
572293 (anti-HCV–) 23
Fwu 2011 Taiwan Pregnant women 289992 (HBsAg +) 6.91 9 4.80 (1.88-12.2) 2
1492409 (HBsAg –) 9
  1. ICC, intrahepatic cholangiocarcinoma; HBsAg, hepatitis B surface antigen; HCV, hepatitis C virus; US, United States.