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Introduction: Limited research exists on intervention efficacy for comorbid subclinical anxiety and depressive disorders, despite their common co-occurrence. Internet- and mobile-based interventions (IMIs) are promising to reach individuals facing subclinical symptoms. Objective: This study aimed to evaluate the efficacy of a transdiagnostic and self-tailored IMI in reducing subclinical anxiety and depressive symptom severity with either individualized (IG-IMI) or automated (AG-IMI) guidance compared to a waitlist control group with care-as-usual access (WLC). Methods: Participants included 566 adults with subclinical anxiety (GAD-7 ≥ 5) and/or depressive (CES-D ≥16) symptoms, who did not meet criteria for a full-syndrome depressive or anxiety disorder. In a three-arm randomized clinical trial, participants were randomized to a cognitive behavioral 7-session IMI plus booster session with IG-IMI (n = 186) or AG-IMI (n = 189) or WLC (n = 191). Primary outcomes included observer-rated anxiety (HAM-A) and depressive (QIDS) symptom severity 8 weeks after randomization assessed by blinded raters via telephone. Follow-up outcomes at 6 and 12 months are reported. Results: Symptom severity was significantly lower with small to medium effects in IG-IMI (anxiety: d = 0.45, depression: d = 0.43) and AG-IMI (anxiety: d = 0.31, depression: d = 0.32) compared to WLC. No significant differences emerged between guidance formats in primary outcomes. There was a significant effect in HAM-A after 6 months favoring AG-IMI. On average, participants completed 85.38% of IG-IMI and 77.38% of AG-IMI. Conclusions: A transdiagnostic, self-tailored IMI can reduce subclinical anxiety and depressive symptom severity, but 12-month long-term effects were absent. Automated guidance holds promise for enhancing the scalability of IMIs in broad prevention initiatives. [ABSTRACT FROM AUTHOR]

Background: Blended psychotherapy (bPT) is a treatment that integrates internet- and mobile-based interventions into out-/inpatient psychotherapy. It can enrich the therapy by using online-based treatment modules as therapeutic extension that patients use time- and location-independently between face-to-face sessions. It could potentially improve the efficacy of psychotherapy and increase the number of treated persons through saved therapist time. The case report aims to facilitate the understanding of the blended treatment components. Case Report: A 4-month short-time depression treatment with six face-to-face therapy sessions, six online lessons, and app ratings of a 48-year-old female patient is presented based on the CARE guidelines and quantitative and qualitative measures (treatment documentation). Depressive symptoms were clinically significantly reduced (PHQ-9, 0–27: T0 = 17; T1 = 7) from a moderately severe to a subclinical-mild degree, and no diagnostic criteria were met in the 12-month follow-up diagnostic interview. The patient showed a maximum treatment satisfaction (ZUF-8, 8–32: T1 = 32) and adherence and rated the therapeutic working alliance (WAI, 12–60: T1 = 57) highly positive. Conclusion: bPT reduced depressive symptoms for this patient. Strengths of the treatment were the facilitated use of the internet-based elements with a full-time job and the individualization within the face-to-face sessions through the therapist. Treatment success was limited by the predetermined six sessions, which hindered addressing all topics and conducting relapse prevention. [ABSTRACT FROM AUTHOR]