RQ2: Relation Between FCR and PD Over Time
PD
Answering the second research question (i.e., does the association between FCR and PD decrease over time), we started with a multivariate multi-group growth model including both FCR and PD scores over time. However, as this multivariate second order growth model did not converge, we used a first order growth model that models the growth parameters based on FCR and PD factor scores at each time point instead of on the questionnaire item scores. We first estimated the factor scores of the FCR and PD measurement models at each of the five time points, and subsequently used these factor scores in a multivariate multi-group first order growth model (Model 5) to investigate how change in FCR scores over time was related to change in PD scores over time and how these relations differed between the CAU and intervention group. To test whether the correlations between FCR and PD were equal over time, we added restrictions in Models 6 and 7, respectively, to the intervention and CAU group. We assessed and interpreted the goodness-of-fit of the latent growth models as described above.