Table 2: Characteristics of studies of HBV infection and CCA risk.

AuthorsYearCountryCases ()Controls ()Control descriptionAdjusted OR (95% CI)Study qualityReference

Lee et al.2015Korea276552Hospital-based control4.12
(2.01–8.44)
7[32]
Zhou et al.2014China126504Hospital-based control19.245
(13.260–27.931)
7[33]
Li et al.2014China183549Hospital-based controlNR8[34]
Chang et al.2013China (Taiwan)51578716Population-based controlNR9[35]
Peng et al.2011China98196Hospital-based control2.75
(1.27–5.95)
8[36]
Cai et al.2011China313608Hospital-based controlNR7[37]
Srivatanakul et al.2010Thailand106106Population-based controlNR6[38]
Zhou et al.2010China317634Hospital-based control9.669
(6.329–14.77)
8[39]
Tao et al.2010China190380Hospital-based controlNR8[40]
Lee et al.2009China (Taiwan)160160Hospital-based control4.985
(2.775–8.945)
6[41]
Zhou et al.2008China312438Hospital-based control8.876
(5.973–13.192)
6[42]
Hsing et al.2008China134762Population-based controlNR8[43]
Lee et al.2008Korea6222488Hospital-based control2.3
(1.6–3.3)
7[44]
Yamamoto et al.2004Japan50200Hospital-based controlNR6[45]

NR: not reported.