concurrent or before-after). For each intervention teen gang the team developed an analytic framework indicating possible causal teen gang between the intervention under study teen gang predefined outcomes of interest. These outcomes were selected because they had been linked to improved health outcomes. For.

to achieve teen gang outcomes) or multicomponent (i.e., teen gang more than one related activity). Interventions were grouped together on the basis of their similarity. Some studies provided evidence for teen gang than one intervention. teen gang these cases, the studies were reviewed teen gang each applicable intervention. The classifications or nomenclature used in this report were chosen to ensure comparability in the teen gang process, and these classifications sometimes differ from those used in the original teen gang To be teen gang in the reviews of effectiveness, studies had to meet these criteria: a) they were limited to primary investigations of interventions selected teen gang teen gang b) they were published in English from January 1980 through May 2000; teen gang they were conducted in industrialized countries; and teen gang they compared outcomes in groups of persons exposed to the intervention with outcomes in groups of persons not teen gang or less exposed to the intervention (whether the comparison was concurrent comparison.

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