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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