Table 2 Risk of bias assessment for eight studies included in “Effect” section
From: A systematic review of tagging as a method to reduce theft in retail environments
Study | Selection bias | Measurement bias | Regression to the mean | Contamination effects |
|---|---|---|---|---|
Farrington et al. (1993) | Medium | Low | High | Medium |
Bamfield (1994) | High | Medium | High | Medium |
DiLonardo and Clarke (1996) | Medium | Medium | High | Medium |
Hayes and Blackwood (2006) | Medium | Low | Low | Medium |
Beck and Palmer (2010) | Medium | Medium | Medium | Medium |
Downs et al. (2011) | High | High | High | High |
Retailer A (2015) | Medium | High | High | High |
Retailer B (2015) | High | High | High | High |