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The numbers reported in Table 1 are from an analysis conducted by Guerette and Bowers (2009) of more than 200 evaluations of situational crime prevention measures. Each evaluation is accessible from the Center for Problem-Oriented Policing website (http://www.popcenter.org/library/scp/). Of the more than 200 evaluations, 102 provided some inspection of displacement or diffusion effects, and, within these, there were 574 different inspections. Each of these were reviewed and recorded by two independent reviewers whether or not there was evidence "consistent with" the possibility of displacement or diffusion effects. The numbers presented should be used as a general guide as to the probability of the various forms of displacement and diffusion occurring and should not be considered as absolute. This is because many studies lacked sufficient research designs to make confident determinations and a few did not provide data to evidence their reporting of the presence of displacement or diffusion. Additionally, most did not allow for the comparison of displacement and diffusion effects relative to the gains achieved by the intervention.
Those studies included in the evaluation met the following conditions:
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