Wilksch Simon M, Wade Tracey D
School of Psychology, Flinders University, PO Box 2100, Adelaide, SA 5001, Australia.
School of Psychology, Flinders University, PO Box 2100, Adelaide, SA 5001, Australia.
Behav Res Ther. 2014 Jan;52:64-71. doi: 10.1016/j.brat.2013.11.004. Epub 2013 Dec 3.
To investigate if baseline depression moderated response to Media Smart, an 8-lesson school-based program previously found to achieve a long-term risk reduction effect in young adolescents.
540 Grade 8 students (M age = 13.62 years, SD = .37) from 4 schools participated with 11 classes receiving the Media Smart program (126 girls; 107 boys) and 13 comparison classes receiving their normal lessons (147 girls; 160 boys). Shape and weight concern, media internalization, body dissatisfaction, dieting, ineffectiveness, and perceived pressure were the outcome variables.
Moderation was indicated by significant interaction effects for group (Media Smart; Control) × moderator (high depression; low depression) × time (post-program; 6-month follow-up; 2.5-year follow-up), with baseline entered as a covariate. Such effects were found for shape and weight concern, media internalization, body dissatisfaction, ineffectiveness and perceived pressure. Post-hoc testing found high depression Media Smart participants scored significantly lower than their control counterparts at post-program on shape and weight concern, media internalization and dieting, whereas low depression Media Smart participants scored significantly lower on shape and weight concern at 2.5-year follow-up.
Media Smart achieved a reduction in eating disorder risk factors for high-depression participants and a reduced rate of growth in risk factor scores for low-depression participants. Trial registry name: Australian New Zealand Clinical Trials Registry. URL: http://www.anzctr.org.au. Registration identification number: ACTRN12608000545369.
调查基线抑郁水平是否会调节对“媒体智慧”项目的反应。“媒体智慧”是一个基于学校的包含8节课的项目，此前发现该项目能在青少年中长期降低风险。
来自4所学校的540名八年级学生（M年龄 = 13.62岁，标准差 = 0.37）参与研究，其中11个班级接受“媒体智慧”项目（126名女生；107名男生），13个对照班级接受常规课程（147名女生；160名男生）。对身材和体重的关注、媒体内化、身体不满意、节食、无效感和感知压力为结果变量。
以基线作为协变量，通过组（“媒体智慧”组；对照组）×调节变量（高抑郁；低抑郁）×时间（项目后；6个月随访；2.5年随访）的显著交互效应表明存在调节作用。在对身材和体重的关注、媒体内化、身体不满意、无效感和感知压力方面发现了此类效应。事后检验发现，高抑郁的“媒体智慧”项目参与者在项目后对身材和体重的关注、媒体内化和节食方面的得分显著低于对照组，而低抑郁的“媒体智慧”项目参与者在2.5年随访时对身材和体重的关注得分显著更低。
“媒体智慧”项目降低了高抑郁参与者的饮食失调风险因素，并降低了低抑郁参与者风险因素得分的增长速度。试验注册名称：澳大利亚新西兰临床试验注册库。网址：http://www.anzctr.org.au。注册识别号：ACTRN12608000545369。
