Table 1 Characteristics of case–control studies of hepatitis viruses infection and ICC risk
First author | Year | Country | Cases (n) | Control (n) | Control description | OR (95% CI) for HBV infection | OR (95% CI) for HCV infection | Study quality |
|---|---|---|---|---|---|---|---|---|
Parkin | 1991 | Thailand | 100 | 100 | Hospital-based control | 1.0 (0.4-2.1) | – | 1 |
Shin | 1996 | Korea | 41 | 406 | Hospital-based control | 1.3 (0.3-5.3) | 3.9 (0.9-17.1) | 2 |
Donato | 2001 | Italy | 26 | 824 | Hospital-based control | 2.7 (0.4-18.5) | 9.7 (1.6-58.9) | 2 |
Yamamoto | 2004 | Japan | 50 | 205 | Hospital-based control | 1.8 (0.3-10.1) | 16.8 (5.7-50.0) | 2 |
Shaib | 2005 | US | 625 | 90834 | Population-based control | 0.8 (0.1-5.9) | 6.1 (4.3-8.6) | 2 |
Choi | 2006 | Korea | 185 | 185 | Hospital-based control | 0.8 (0.198-3.023) | 1.0(0.04-25.264) | 2 |
Shaib | 2007 | US | 83 | 236 | Hospital-based control | 2.9 (0.1-236.8) | 7.9 (1.3-84.5) | 2 |
Welzel | 2007 | US | 535 | 102782 | Population based control | – | 4.4 (1.4-14.0) | 1 |
Lee | 2008 | Korea | 622 | 2488 | Hospital-based control | 2.3 (1.6-3.3) | 1.0 (0.5-1.9) | 2 |
Zhou | 2008 | China | 312 | 438 | Hospital-based control | 8.876 (5.98-13.19) | 0.933 (0.281-3.1) | 2 |
Lee | 2009 | Taiwan | 160 | 160 | Hospital-based control | 4.985 (2.78-8.95) | 2.71 (1.16-6.32) | 2 |
Tao | 2010 | China | 61 | 380 | Hospital-based control | 18.1 (7.5-44.0) | – | 1 |
Peng | 2011 | China | 98 | 196 | Hospital-based control | 2.75 (1.27-5.95) | – | 1 |