All six studies that evaluated program impact on knowledgebased measures noted statistically significant effects, mostly in the areas of HIV and STIs. Halpern et al. [7] demonstrated significant increases in three emergency contraception knowledge
items among Kenyan participants, but significant decreases were found in the Brazilian sample on two of the same measures.Youth in Lou et al’s intervention had significant (p.05) gains in knowledge in all five areas evaluated (reproduction, contraception,
condoms, STIs, and HIV/AIDS) but showed no reductions in behaviors (hugging, kissing, petting, or sexual intercourse) [8]. Finally, attitudes toward the interventions themselves were usually positive. Marsch et al. [11] found that participants perceived the addition of a Web-based program as more useful than a 1-hour educator-delivered intervention. The HIV-positive youth who participated in +CLICK indicated that they were very likely to use it again [9]. Participants of the intervention described by Roberto et al. [14] had very favorable impressions of the “truth or myth” activity but gave low ratings to the radio PSA. Finally, Puccio et al. [13] noted that respondents in their 12-week intervention program found mobile phone call reminders to be helpful and unobtrusive.