Primary analyses
RNT-focused, depressive, depressive symptoms
A linear mixed-effects model will be computed to analyze whether the two versions of the app reduced depressive symptoms (sum score on the IDS, primary outcome variable) relative to the control condition. In the model, the effect of condition (full RNT-focused intervention, concreteness training intervention, waiting list control condition), time (pre-intervention, post-intervention), and condition × time interaction will be tested. Simple slope tests will be conducted to determine whether (a) the full RNT-focused intervention significantly reduced depressive symptoms relative two the waiting list control condition and (b) the concreteness training intervention significantly reduced depressive symptoms compared to the waiting list control condition.