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Despite their proliferation, limited knowledge exists regarding possible benefits of brief mindfulness ecological momentary interventions (MEMIs) for social anxiety disorder (SAD). Propositions that MEMIs could alleviate SAD symptoms and related clinical outcomes remain untested. This trial evaluated a 14-day MEMI for SAD. Participants with self-reported SAD were randomized to MEMI (n = 96) or self-monitoring app (SM; n = 95). Whereas MEMI instructed mindfulness exercises, SM prompted only self-monitoring five times daily for 14 days. Participants completed state-level self-reports of depression, anxiety, and mindfulness pre-post-mindfulness practice and SAD symptoms, worry, depression severity, repetitive negative thinking, and trait mindfulness at pre-randomization, post-intervention, and 1-month follow-up (1MFU). Hierarchical linear modeling was conducted. The MEMI yielded statistically significantly larger improvements in momentary depression, anxiety, and mindfulness (Cohen's d = −0.10–0.11). Although no between-group effects emerged in alleviating SAD fear and avoidance, excessive worry, depression severity, repetitive negative thinking, and trait mindfulness (−0.13–0.15), within-group effects were significantly small-to-large from pre-post and pre-1MFU (−4.62–0.67). A significant reduction in depression severity occurred in MEMI (−0.63–−0.60) but not SM (−0.31–−0.29). Brief MEMI and SM yielded nondifferent sustained effects on SAD, comorbid symptoms, and risk factors, highlighting its potential value within stepped-care delivery settings. • MEMI (vs. SM) notably improved state depression, anxiety, and mindfulness. • MEMI and SM enhanced SAD, worry, repetitive thinking, and trait mindfulness. • Depression severity was reduced in the MEMI but not the SM arm. • Brief MEMI might be efficacious for targeting pathological worry but not SAD. • MEMIs for SAD must be high-intensity and have exposure therapy to be efficacious. [ABSTRACT FROM AUTHOR]

Online treatment delivery has the potential to increase access to evidence-based mental health care for children with anxiety disorders. Using a randomized controlled trial design, we evaluated the efficacy of Cool Kids Online, a family-based and therapist supported internet-delivered cognitive behavioral treatment (CBT) designed to target anxiety disorders in children. Ninety-five children aged 7–12 years with a DSM-5 anxiety disorder were randomly allocated to Cool Kids Online or a waitlist control. Children were assessed at baseline, week 11, and 6-months following treatment. Children in waitlist received treatment after week 11 and also completed assessments immediately and six months after treatment, allowing treatment maintenance to be evaluated for all children. Compared to waitlist, Cool Kids Online led to significantly greater remission of anxiety disorders (primary and all anxiety diagnoses) and greater reduction of caregiver-reported anxiety symptoms and interference at week 11. Child-reported anxiety symptoms and interference and child- and caregiver-reported depressive or externalizing symptoms did not differ significantly between conditions. Medium to large within-treatment effects were observed for all children from pre to post treatment with post treatment effects maintained until follow-up. Overall, the findings provide support for the efficacy of the program in treating anxiety. Cool Kids Online compared to waitlist for the remission of anxiety disorders in clinically anxious children; anzctr.org.au ; ACTRN12615000947505. • Online family-based cognitive behaviour therapy reduces child anxiety disorders. • Therapist support during online child anxiety programs may be important for change. • Cool Kids Online is a promising method to improve access to child anxiety treatment. [ABSTRACT FROM AUTHOR]