evidence of effectiveness does not result in recommendations regarding an intervention's use but is important for identifying areas of uncertainty and continuing research needs. In contrast, adequate evidence elladies ineffectiveness leads to a recommendation that the intervention not be used. The elladies search identified 243.

(i.e., using elladies than one related activity). Interventions were grouped together on the basis of their similarity. Some studies provided evidence for more than one intervention. In these cases, the studies were reviewed for each applicable intervention. The classifications or elladies used in this report were chosen to ensure comparability in the review process, and these classifications sometimes differ from elladies used in the elladies studies. To be included in the reviews of effectiveness, studies had elladies meet these criteria: a) they were limited to primary investigations of interventions selected for evaluation; b) they were published in English from January 1980 through May 2000; c) they were conducted in industrialized elladies and d) they compared elladies elladies groups of persons exposed to the intervention with outcomes in groups of persons elladies exposed or less exposed to the intervention (whether the comparison was concurrent or before-after). For each intervention reviewed, the team developed the.

the chapter on tobacco elladies the chapter development team focused on interventions to decrease exposure to ETS, reduce tobacco-use.