From: Risk markers for fatal and non-fatal prescription drug overdose: a meta-analysis
 | Selection (score) |  |  |  | Comparability (score) | Exposure (score) |  |  | Total score |
---|---|---|---|---|---|---|---|---|---|
Case definition | Representative of cases | Selections of controls | Definition of controls | Control for important covariates | Ascertainment of exposure | Same method of ascertainment for participants | Nonresponse rate | Out of 10 points | |
Bohnert et al. 2011 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 10 (high) |
Brady et al. 2015 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 10 (high) |
Cerdá et al. 2013 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 (high) |
Dilokthornsakul et al. 2016 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 10 (high) |
Gomes et al. 2011 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 10 (high) |
Lanier et al. 2012 | 1 | 1 | 1 | 1 | 2 | 0 | 0 | 0 | 6 (low) |
Paulozzi et al. 2012 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 8 (high) |
Peirce et al. 2012 | 1 | 1 | 2 | 1 | 0 | 1 | 1 | 1 | 8 (high) |
Whitmire and Adams 2010 | 0 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 10 (high) |
Zedler et al. 2014 | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 10 (high) |
 |  |  |  |  |  |  |  | mean | 9.0 |