Jan Wardęszkiewicz

2 papers in the library · publishing 2026

Papers

Efficacy and mechanisms of internet-delivered mindfulness-based cognitive therapy for Adjustment Disorder: A randomized controlled trial.

Journal of Anxiety Disorders July 1, 2026 Paweł Holas, Jan Wardęszkiewicz, Malgorzata Grochowska et al.

A randomized controlled trial with 301 adults diagnosed with Adjustment Disorder tested a brief, internet-delivered Mindfulness-Based Cognitive Therapy (iMBCT) against internet-delivered progressive muscle relaxation (iPMR) and a waitlist control over four weeks. iMBCT reduced Adjustment Disorder symptoms more than the waitlist control and produced higher remission rates. Compared with iPMR, iMBCT led to larger decreases in depression and anxiety. Cognitive defusion fully mediated iMBCT's effects on depression and anxiety. Some improvements persisted at one-month follow-up, but the authors caution that findings are mixed due to substantial attrition.

DOI: 10.1016/j.janxdis.2026.103173 Full text Adjustment disorder Covid-19 pandemic Cognitive defusion Internet-delivered intervention +2

Synchronous online group MBCT vs guided asynchronous iMBCT in depressed sample: randomized clinical trial with a 3-month follow-up

Jan Wardęszkiewicz, Paweł Holas, Gerhard Andersson

Both synchronous and asynchronous online Mindfulness-Based Cognitive Therapy (iMBCT) reduce depressive symptoms in people with mild to moderate depression. In a randomized trial, 170 participants were assigned to a 6-week synchronous iMBCT group, asynchronous iMBCT group, or waitlist control. Both iMBCT formats significantly lowered depression compared to the control, with gains sustained at 3-month follow-up. Mindfulness and cognitive defusion mediated the effect, explaining 52% of post-treatment depression severity. Participants also showed decreased rumination and anxiety, and increased self-compassion and resilience, maintained at follow-up.

DOI: 10.21203/rs.3.rs-7166236/v1