does not result in recommendations regarding an intervention's use but is important for identifying areas of top-teen-sex and continuing research needs. In contrast, adequate evidence of ineffectiveness leads to a recommendation top-teen-sex the intervention not be top-teen-sex The top-teen-sex search identified 243 studies on tobacco.

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

useful in a particular setting top-teen-sex population. Though limited, economic information --- to be provided in the full report in 2001.