This is an application to develop and test methodological innovations related to """"""""Youthnet,"""""""" a randomized controlled trial (RCT) that is designed to test, with a clinic-based sample, the efficacy of computer-based, tailored, interactive condom use messages for increasing positive outcome expectancies towards condoms, condom use norms, self-efficacy for condom negotiation and use, and condom use with non-main sexual partners. For this methodological supplemental application, we will focus on three methodological aims: Supplemental Aim 1: To replicate the clinic-based Youthnet RCT with a probability sample recruited exclusively on two separate sites on the Internet. Supplemental Aim 2: To test, using the Internet sample, the psychometric properties of four behavioral scales developed for this study; outcome expectancies for condom use; condom norms; self-efficacy for condom negotiation and self-efficacy for use. Supplemental Aim 3: To compare a) recruitment and retention rates and b) baseline and outcome data on outcome expectancies, norms, self-efficacy for condom negotiation and use and condom use of the clinic based and Internet-based samples. The study questions we will answer with this supplement include: ? 1. Will people aged 18-24 recruited through banner ads online enroll in a study about HIV/STD risk? ? 2. Will persons enrolled online return for a one-month booster session and a two-month follow- up session and with what level of attrition? ? 3. Are the psychometric properties of the study instrument the same for an online sample compared to a clinic-based sample? ? 4. What is the efficacy of the intervention for increasing condom use with non-main partners for the online sample? ? ?
| Bull, Sheana S; Levine, Deborah K; Black, Sandra R et al. (2012) Social media-delivered sexual health intervention: a cluster randomized controlled trial. Am J Prev Med 43:467-74 |
| Bull, Sheana; Pratte, Katherine; Whitesell, Nancy et al. (2009) Effects of an Internet-based intervention for HIV prevention: the Youthnet trials. AIDS Behav 13:474-87 |
| Bull, S S; Vallejos, D; Levine, D et al. (2008) Improving recruitment and retention for an online randomized controlled trial: experience from the Youthnet study. AIDS Care 20:887-93 |
| Bull, Sheana Salyers; Phibbs, Stephanie; Watson, Sally et al. (2007) What do young adults expect when they go online? Lessons for development of an STD/HIV and pregnancy prevention website. J Med Syst 31:149-58 |
