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. 2003 Apr 1;10(2):238.
doi: 10.1207/S15328007SEM1002_5.

Investigation of Mediational Processes Using Parallel Process Latent Growth Curve Modeling

Jeewon Cheong  1 , David P Mackinnon, Siek Toon Khoo
Affiliations

Investigation of Mediational Processes Using Parallel Process Latent Growth Curve Modeling

Jeewon Cheong et al. Struct Equ Modeling. .

Abstract

This study investigated a method to evaluate mediational processes using latent growth curve modeling. The mediator and the outcome measured across multiple time points were viewed as 2 separate parallel processes. The mediational process was defined as the independent variable influencing the growth of the mediator, which, in turn, affected the growth of the outcome. To illustrate modeling procedures, empirical data from a longitudinal drug prevention program, Adolescents Training and Learning to Avoid Steroids, were used. The program effects on the growth of the mediator and the growth of the outcome were examined first in a 2-group structural equation model. The mediational process was then modeled and tested in a parallel process latent growth curve model by relating the prevention program condition, the growth rate factor of the mediator, and the growth rate factor of the outcome.

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Figures

FIGURE 1
FIGURE 1
A single mediator model.
FIGURE 2
FIGURE 2
A parallel process latent growth model for mediation. X = treatment program condition; Y = outcome; M = mediator; η1 = initial status factor of mediator; η2 = growth rate factor of mediator; η3 = initial status factor of outcome; η4 = growth rate factor of outcome.
FIGURE 3
FIGURE 3
Model-based change in peer team leaders as an information source over six measurement time points.
FIGURE 4
FIGURE 4
Model-based change in nutrition behaviors over six measurement time points.
FIGURE 5
FIGURE 5
A parallel process latent growth model for mediation: Program effect on the growth of nutrition behaviors via the growth of perceived importance of peer team leaders as an information source. Program = prevention program condition; Nutrit = nutrition behaviors (outcome); PerLeader = team leaders as an information source (mediator); η1 = initial status factor of PerLeader; η2 = growth rate factor of PerLeader; η3 = initial status factor of Nutrit; η4 = growth rate factor of Nutrit.
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