Annenberg Public Policy Center, University of Pennsylvania, Philadelphia, PA 19104, USA.
Am J Public Health. 2013 Jan;103(1):134-40. doi: 10.2105/AJPH.2012.300856. Epub 2012 Nov 15.
We estimated the long-term (36-month) effects of Project iMPPACS, a multisite randomized controlled trial of mass media and small-group intervention for African American adolescents.
We collected 6 waves of longitudinal data on program participants aged 14 to 17 years (n = 1139) in Providence, Rhode Island; Syracuse, New York; Columbia, South Carolina; and Macon, Georgia, 36 months (December 2009-December 2010) after the intervention began (August 2006-January 2008). Seemingly unrelated regressions at each wave estimated the effects of 3 types of mass media messages (the thematic mediators: selection, pleasure, and negotiation) on condom use intention and self-reported unprotected vaginal sex events.
All 3 mediators of behavior change that were introduced during the media intervention were sustained at the follow-up assessments at least 18 months after the intervention ended, with intention having the largest correlation. Unprotected vaginal sex increased with each wave of the study, although cities receiving media exposure had smaller increases.
Project iMPPACS demonstrates that mass media influence delivered over an extended period, when adolescents were beginning to learn patterns of behavior associated with sex, persisted after the media program ended.
我们评估了 iMPPACS 项目的长期（36 个月）效果，该项目是一项针对非裔美国青少年的大众媒体和小组干预的多地点随机对照试验。
我们收集了来自罗德岛州普罗维登斯、纽约州锡拉丘兹、南卡罗来纳州哥伦比亚和佐治亚州梅肯的 1139 名 14 至 17 岁的项目参与者在 6 个时间点的纵向数据（2009 年 12 月至 2010 年 12 月），该数据是在干预开始后 36 个月（2006 年 8 月至 2008 年 1 月）收集的。在每个时间点，看似不相关的回归估计了 3 种大众媒体信息（主题调解人：选择、愉悦和协商）对避孕套使用意愿和自我报告的无保护阴道性行为事件的影响。
在媒体干预中引入的所有 3 种行为改变调解人都在干预结束后至少 18 个月的随访评估中得以维持，意图的相关性最大。尽管接受媒体曝光的城市增加幅度较小，但无保护阴道性行为随着研究的每一波次而增加。
iMPPACS 项目表明，在青少年开始学习与性行为相关的行为模式的过程中，长时间（36 个月）传播的大众媒体影响在媒体项目结束后仍然存在。
