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Table 1 Characteristics of 7 included case-control studies

From: Non-alcoholic fatty liver disease as a risk factor for cholangiocarcinoma: a systematic review and meta-analysis

Author, year Country Dates NAFLD Diagnosis Source Study qualitya
Welzel et al. 2007 [10] US 1999–2009 ICD9 Community Fair
Zhou et al. 2009 [20] China 2003–2006 Imaging Hospital Good
Chang et al. 2013 [17] Taiwan 2004–2008 ICD9 Community Fair
Lee et al. 2015 [18] South Korea 2007–2013 Histology or imaging Hospital Good
Kinoshita et al. 2016 [9] Japan 1995–2014 Histology Hospital Fair
Choi et al. 2016 [16] US 2000–2014 Histology or imaging Hospital Good
Stepien et al. 2016 [19] 10 European countries 1992–2000 Hepatic steatosis index Community Good
  1. NAFLD Non-alcoholic fatty liver disease
  2. aBased on Newcastle-Ottawa Scale (NOS). See Additional file 2: Data S5