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Table 1 Characteristics of studies included in the meta-analyses

From: Alcohol use disorders and the risk of progression of liver disease in people with hepatitis C virus infection – a systematic review

Reference

Country

Type of study

Years of Study

N

(N of outcome)

Measurement of AUD

(N of people with AUD)

Outcome

Risk Relationsa

Adjusted yes/no

Alavi et al., 2018 [29]

Australia

Cohort study based on record linkage

1995–2013 (1995–2012 HCV notifications)

82,526 (2559)

Non-liver-related hospitalization due to alcohol use disorders 2001–2013 (prior to outcome)

(N = 14,797)

First-time hospitalization (or death, if no prior hospitalization) due to decompensated cirrhosis

HR: 3.68

(3.38–4.00)

y

Alavi et al., 2018 [29]

Canada

Cohort study based on record linkage

1995–2012 (1995–2011 HCV notifications)

55,873 (2443)

Non-liver-related hospitalization due to alcohol use disorders 2001–2012 (prior to outcome)

(N = 11,078)

First-time hospitalization (or death, if no prior hospitalization) due to decompensated cirrhosis

HR: 1.92

(1.76–2.10)

y

Alavi et al., 2018 [29]b

Scotland

Cohort study based on record linkage

1995–2014 (1995–2013 HCV notifications)

30,746 (1020)

Non-liver-related hospitalization due to alcohol use disorders 2001–2014 (prior to outcome)

(N = 8757)

First-time hospitalization (or death, if no prior hospitalization) due to decompensated cirrhosis

HR: 3.88

(3.42–4.40)

y

Harris et al., 2001 [19]

USA

Retrospective cohort study.

1968–1980

836 (142)

Loss of friends, family or job because of drinking; admitted to ever having a problem with alcoholism, medical records; sustained use of > 80 g/day

(N = 149)

Liver cirrhosis

OR: 4.0

(2.1–7.7)

y

Lim et al., 2014 [30]

USA

Case-control study

2002–2010

997 (27)

ICD-9 diagnosis for alcohol dependence/abuse recorded

(N = 376)

Medical record–confirmed decompensated cirrhosis

OR: 2.46

(1.13–5.37)

n

Marcellin et al., 2014 [31]

France

Case-control study

Not specified

304 (77)

Alcohol-related problems (physician’s report)

(N = 41)

Advanced fibrosis

OR: 3.06

(1.42–6.60)

y

Marcellin et al., 2015 [32]

France, Germany, Italy, Spain, UK

Case-control study

2006

1333 (438)

Chronic alcoholism (physician’s judgement)

(N = 55)

Advanced fibrosis

OR: 2.51

(1.24–5.08)

y

McDonald et al., 2010 [33]b

Scotland

Cohort study based on record linkage

1996–2006

15,878 (481)

Hospitalization due to alcohol use disorders or 100% alcohol-attributable disease 1996–2006 (prior to outcome)

(N = 274)

First-time hospitalizations (or death, if no prior hospitalization) due to decompensated cirrhosis

HR: 5.50

(4.56–6.63)

y

Nilsson et al., 2016 [34] e

Sweden

Case-control analysis at baseline of a cohort study

2001–2010

284 (67 ascites, 15 variceal-bleeding, 9 encephalopathy)

Alcoholism or overconsumption of alcohol as stated in the medical records

(N = 114)

Decompensated cirrhosis

OR: 3.24

(1.77–8.99)e

n

Nilsson et al., 2016 [34] c

Sweden

Cohort study

2001–2010 (average follow-up 4.3 years)

284 (174)

Alcoholism or overconsumption of alcohol as stated in the medical records

(N = 114)

Death (majority due to liver disease)

HR: 1.83

(1.34–2.51)

yd

Schwarzinger et al., 2017 [8]

France

Retrospective cohort study based on record linkage

2008–2013

97,347 (15,630)

Hospitalization due to alcohol use disorders or 100% alcohol-attributable disease

(N = 28,101)

First record of decompensated cirrhosis hospitalization

OR: 6.20

(5.85–6.58)

y

Schwarzinger et al., 2017 [8]

France

Retrospective cohort study based on record linkage

2008–2013

97,347 (6677)

Hospitalization due to alcohol use disorders or 100% alcohol-attributable disease

(N = 28,101)

Liver death (without liver transplantation)

OR: 7.63

(8.30–7.97)

y

Sultanik et al., 2016 [35]

France

Retrospective cohort study

2006–2015

341 (136)

Either ICD-10 codes describing mental and behavioural states due to alcohol use disorders or 100% alcohol attributable

Hepatocellular carcinoma (35%) and/or end-stage liver disease

HR: 1.47

(1.02–2.13)

y

Verbaan et al., 1998 [36]

Sweden

Case control

1991–1997

99 (20)

Use of > 80 g/day for at least 5 years; 92% of these were registered at Department of Alcohol Diseases, University Hospital, Malmö

(N = 45)

Cirrhosis

OR: 11.8

(1.9–72.1)

y

Wawrzynowicz-Syczewska et al., 2004 [37]

Poland

Cohort study

1988–2001

77 (22)

History of alcohol abuse (physician’s judgment)

(N = 32)

Advanced fibrosis

OR: 10.00

(2.29–43.70)

n

  1. Highlighted areas were included in the main outcome variable: decompensated liver cirrhosis
  2. HR Hazards Ratio, OR Odds Ratio
  3. a Risk relations are either Relative Risks, Hazard Ratios or Odds Ratios
  4. b The samples of the two studies [19, 33] overlap, with the methodology being slightly different (see definition of AUD). Only Alavi et al., 2018 [29] was included in the main quantitative meta-analysis
  5. c This outcome was not included into the second meta-analysis, as it was all-cause mortality, which is not a liver-specific outcome
  6. d The HR was estimated based on the methodology of Hamling et al. [26]
  7. e The combined OR was estimated by weighting the OR for ascites (OR: 4.39 (2.45–7.85)), variceal-bleeding (OR: 0.53(0.16–1.69)) and encephalopathy (OR: 5.50 (1.12–2.95)) by weighting the excess risks by the probability of risk occurrence