A randomized controlled design will be carried out, in which the effectiveness and user- friendliness of an online app-based VR self-help treatment '0-anxiety' will be evaluated. Our primary objective is to determine the clinical effects (a reduction in anxiety symptoms at post-test [between the experimental condition and controls] of 0-anxiety, and whether effects are sustainable at follow-up [a reduction in anxiety symptoms between baseline and follow-up for those in the experimental condition]). Our secondary objective is to determine the user-friendliness of 0-anxiety. In this study, 230 children from the Brazilian population will be randomized over 2 conditions: the experimental condition (0-anxiety) and a waitlist condition. The duration of the intervention will be 3 weeks. Measures will be taken at baseline, directly after the intervention (3 weeks) and at 3 months (follow-up). All measures will be completed online. Therefore, the child will participate in the study in his/her natural environment. Subjects in the wait-list condition will receive the intervention after completion of the post-test. Randomization (block-randomization) will be performed by an independent researcher.
To examine the efficacy of a fully self-guided app-based virtual reality cognitive behavior therapy (VR CBT) using low-cost (cardboard) virtual reality goggles compared with a wait-list control group and to determine its user friendliness. We hypothesize that children with GAD enrolled in the self-guided app will present lower scores of anxiety.