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

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