Freie Universitat Berlin, Department of Health Psychology, 14195 Berlin, Germany.
Psychol Health. 2009 Jan;24(1):67-79. doi: 10.1080/08870440801958214.
Action planning is assumed to mediate between intentions and health behaviours. Moreover, intentions are assumed to moderate the planning-behaviour relation, because people with high intentions are more likely to enact their plans. The present studies extend these suppositions by integrating both assumptions to a novel and parsimonious model of moderated mediation: the mediation effect is hypothesised to be stronger in individuals who report higher intention levels. In two longitudinal studies on physical activity (N = 124) and interdental hygiene (N = 209), intentions and action planning were assessed at baseline, and behaviour was measured four (Study 1), and respectively, three (Study 2) months later. The moderated mediation hypothesis was tested with continuously measured intentions using regression analyses with non-parametric bootstrapping. Results from both studies suggest that levels of intentions moderate the mediation process: The strength of the mediated effect increased along with levels of intentions. Planning mediates the intention-behaviour relation, if individuals hold sufficient levels of intentions. Implications for theory advancement and intervention development are discussed.
行动规划被认为在意图和健康行为之间起中介作用。此外，意图被认为可以调节规划-行为关系，因为高意图的人更有可能实施他们的计划。本研究通过将这两个假设整合到一个新颖且简约的中介调节模型中，进一步扩展了这些假设：假设在报告更高意图水平的个体中，中介效应更强。在两项关于体育活动（N=124）和牙间清洁（N=209）的纵向研究中，意图和行动规划在基线时进行评估，行为在四个月（研究 1）和分别在三个月（研究 2）后进行测量。使用带有非参数引导的回归分析，对连续测量的意图进行了中介调节假设检验。两项研究的结果均表明，意图水平调节了中介过程：随着意图水平的提高，中介效应的强度也随之增加。如果个体具有足够的意图水平，则规划可以调节意图-行为关系。讨论了对理论发展和干预发展的影响。
