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Table 1 Quality ratings of included studies

From: Effectiveness of bystander naloxone administration and overdose education programs: a meta-analysis

Authors Research questions/objectives/hypothesis are clear and appropriate Clear overview of intervention is given with use of appropriate outcome measures Sample size is given Randomization method used in sample selection Attrition rate is recorded and discussed Data analysis is adequately described and rigorous Outcomes are clearly described Ethical issues are suitably addressed Total score
Williams et al. (2014) 1 1 1 1 1 1 1 1 8
Gaston et al. (2009)a 1 1 1 0 1 1 1 1 7
Strang et al. (2008)a 1 1 1 0 1 1 1 1 7
Green et al. (2008) 1 1 1 0 N/A 1 1 1 6
Jones et al. (2014) 1 1 1 0 N/A 1 1 1 6
Lankenau et al. (2013) 1 1 1 0 [0.5] N/A 1 0 [0.5] 1 6
McAuley et al. (2010) 1 1 1 0 1 1 1 1 7
Galea et al. (2006) 1 1 1 0 1 1 1 1 7
  1. aStrang et al. (2008) uses the same sample as Gaston et al. (2009); Values in brackets are ratings that differ from those attributed by Clark et al. (2014).