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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.