4 219 MENTAL HEALTH OUTCOMES OF APPLIED GAME MINDLIGHT For Whom are MindLight and CBT effective? As described above, we started with the quadratic growth model of anxiety symptoms found in Schoneveld et al. (2018). This model showed that both child- and mother-reported anxiety symptoms decreased quadratically over time (i.e., the rate of the decrease slowed over time) in both the MindLight and CBT group. In the current study, we added social, emotional and academic selfefficacy, levels of maternal depression, anxiety and stress, and baseline anxiety separately as outcome predictors to the quadratic model. None of these predicted the linear nor the quadratic slope component for both child- and mother-reported anxiety symptoms (Table 6). However, social, emotional and academic self-efficacy, and mother-reported baseline anxiety were associated with the intercept of the quadratic growth model of child-reported anxiety. Specifically, children with higher levels of social, emotional and/or academic self-efficacy, and/or lower levels of mother-reported baseline anxiety showed lower initial levels of child-reported anxiety. In addition, levels of maternal depression, anxiety and stress predicted the intercept of the quadratic growth model of mother-reported anxiety: children from mothers with lower levels of depression, anxiety and stress, showed lower initial levels of mother-reported anxiety. Results from the LGCM of the outcome prediction analyses in the completers only sample are similar and available in Appendix E. DISCUSSION This study reported secondary outcomes and outcome predictors of effectiveness of a non-inferiority RCT comparing the applied game MindLight with a CBT-program (Coping Cat; Van Starrenburg et al., 2017) for childhood anxiety prevention. Findings were reported for post-intervention, 3- and 6-months follow-up using child- and mother-reports. Improvement in Mental Health Outcomes The first set of hypotheses were supported in that children in both intervention groups showed improvements in internalising and externalising problems, and self-efficacy. The CI approach showed affirmatively that MindLight was non-inferior to CBT over the course of the study for social self-efficacy, emotional self-efficacy, academic self-efficacy and internalising problems. CBT, however, showed a larger decrease in externalising problems at post-test and 6-months follow-up. Importantly, improvements in secondary outcomes were sustained up to 6 months after intervention completion. Thus, a relatively short
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