Post-hoc Probing of Significant Moderational and Mediational Effects in Studies of Pediatric Populations
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Open Access
- 1 January 2002
- journal article
- review article
- Published by Oxford University Press (OUP) in Journal of Pediatric Psychology
- Vol. 27 (1) , 87-96
- https://doi.org/10.1093/jpepsy/27.1.87
Abstract
Objective: To provide examples of post-hoc probing of significant moderator and mediator effects in research on children with pediatric conditions. Methods: To demonstrate post-hoc probing of moderational effects, significant two-way interaction effects (dichotomous variable × continuous variable; continuous variable × continuous variable) were probed with regressions that included conditional moderator variables. Regression lines were plotted based on the resulting regression equations that included simple slopes and y-intercepts. To demonstrate probing of mediational effects, the significance of the indirect effect was tested (i.e., the drop in the total predictor → outcome effect when the mediator is included in the model), using Sobel's ( 1988) equation for computing the standard error of the indirect effect. Results: All significant moderator and mediator effects are presented in figure form. Conclusions: The computational examples demonstrate the importance of conducting post-hoc probes of moderational and mediational effects.Keywords
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