A clinical trial of a smartphone app delivering digital cognitive behavioral therapy (DCBT) for severe generalized anxiety disorder found that 77.7% of participants achieved remission at 24 weeks, significantly outperforming a control group. However, the control group—which received only online psychoeducation about anxiety—also showed substantial improvement, with remission rates exceeding 52%.
Study Details
The randomized trial enrolled 351 participants, approximately three-quarters of whom were women and three-quarters white. All participants began with severe GAD. About a quarter in each group were already taking anxiety medications, meaning roughly three-quarters received the digital intervention as their sole treatment form. The study, led by E. Marie Parsons at Boston University, was published in JAMA Network Open.
Key Findings and Limitations
The DCBT group demonstrated rapid response, achieving a 71% remission rate by 10 weeks, while the psychoeducation control group reached only 34.6% at the same timepoint. However, the control group’s remission rate climbed to over 52% by week 24, suggesting anxiety may have improved over time even without intensive intervention. The researchers did not explore whether this reflected a potential “nocebo” effect among those taking medication.
Notably, medication effects diverged between groups—appearing to enhance remission likelihood in the DCBT group while reducing it in the psychoeducation group, a pattern the researchers did not address. Dropout rates were low and blinding was maintained for nearly all participants.
Funding and Context
Big Health, Inc., the company providing the DCBT app, designed and sponsored the trial. The lead researcher and other authors received funding from Big Health, and five authors were direct company employees—conflicts of interest noted in an editor’s update to the article.
The researchers concluded that “the consistent evidence for the efficacy of this smartphone-accessible DCBT suggests it is a scalable, first-line treatment option for adults with GAD.” Yet their data simultaneously demonstrate that less intensive approaches like psychoeducation produced remission in more than half of participants, raising questions about treatment necessity for even severe anxiety cases.
This article is an AI-assisted summary. All facts and figures are drawn from the original report: https://www.madinamerica.com/2025/12/severe-anxiety-vastly-improves-after-minimal-treatment/