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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