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J Pediatr Psychol. 2002 Jan-Feb;27(1):87-96.

Post-hoc probing of significant moderational and mediational effects in studies of pediatric populations.

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1
Loyola University of Chicago, Chicago, IL 60626, USA. gholmbe@luc.edu

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 x continuous variable; continuous variable x 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.

PMID:
11726683
[Indexed for MEDLINE]
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