In longitudinal studies of pornography use, selective loss of participants who may be more vulnerable to the effects of pornography than their peers is a serious concern. To explore the potential for such selective dropout, we used data from two independent large-scale panel studies of adolescents’ pornography use. Of the three types of attrition—early attrition, later attrition, and gaps in participation—only the first was substantially higher among more vulnerable adolescents, compared with other participants. Panel type (online vs. classroom-based) moderated only the association between vulnerability and participation gaps, which was significant in the classroom-based but not the online panel. Overall, this study’s findings point to the importance of delaying selective dropout by developing a comprehensive plan of action, for which we offer some guidelines.

在色情使用的纵向研究中，选择性地失去可能比同龄人更容易受到色情影响的参与者是一个严重的问题。为了探索这种选择性辍学的可能性，我们使用了来自两个独立的青少年色情使用大规模小组研究的数据。在三种类型的减员中——早期减员、后期减员和参与差距——与其他参与者相比，在更脆弱的青少年中，只有第一种明显更高。小组类型（在线与基于课堂的）仅调节脆弱性和参与差距之间的关联，这在基于课堂的小组而不是在线小组中很重要。总的来说，这项研究的结果指出了通过制定全面的行动计划来延迟选择性辍学的重要性，