Supplementary results. Table S2. Quality assessment of the included studies using the ‘risk of bias’ tool.
Based on the Risk of Bias tool* for assessing the quality of prevalence studies
Included studies (n=
20)
External validity Internal validity
Summary for the overall
riskb 1. Adequate
definition of casesa
2.
Representativeness of cases
3. Random selection of
cases
4. Non-response bias minimal
5. Data collected directly from
the subjects
6. Acceptable case definition used in the
study
7. Reliability and validity of
study instrument
8. Same mode of data collection for
all subjects
9. Appropriate length of the
shortest prevalence period
10. Appropriate numerator and denominator Current use of cocaine (n= 3)
(Elangovan et
al. , 1993) High risk High risk High risk High risk Low risk High risk High risk Low risk Low risk High risk High risk
(Kalayasiri et
al. , 2006b) High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Mooney et al.
, 2006) High risk High risk Low risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
Lifetime use of cocaine (n= 17) (Araos et al. ,
2015) Low risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Brady et al. ,
1991) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Cubells et al.
, 2005) Low risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Floyd et al. ,
2006) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Gonzalez- Saiz et al. ,
2014)
High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Kalayasiri et
al. , 2006a) Low risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Miguel et
al. , 2018) High risk High risk High risk High risk Low risk High risk High risk Low risk Low risk Low risk High risk
(Reid et al. ,
2004) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Roncero et
al. , 2017) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
Supplementary results. Table S2. Quality assessment of the included studies using the ‘risk of bias’ tool.
(Satel et al. ,
1991) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Smith et al. ,
2009) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Tang et al. ,
2007) Low risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Trape et al. ,
2014) High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Vergara- Moragues et
al. , 2012)
High risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(Vergara- Moragues et
al. , 2014)
High risk High risk High risk High risk Low risk High risk High risk Low risk Low risk High risk High risk
(Willi et al. ,
2017) High risk High risk High risk High risk Low risk High risk High risk Low risk Low risk Low risk High risk
(Zayats et al. ,
2013) Low risk High risk High risk High risk Low risk Low risk Low risk Low risk Low risk Low risk Low risk
(a) The target population of our study are cocaine users, defined as cocaine users in the general population with exclusion of primary psychosis.
(b) ‘Low risk’ studies were defined on the basis or the risk concerning external and internal validity, and studies using adequate tools/interview to assess the primary outcome
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