<p>Questionnaire assessment schedule.</p>

Participants will be randomised 1:1 to receive either Thumos (two online group workshops and one individual video/phone call) or SAU. Assessments will occur at baseline, post-intervention, 4-month, and 9-month follow-up. The primary outcome is psychological resilience measured by the Brief Resilience Scale at 4-month follow-up.

A mixed-methods process evaluation will assess acceptability and feasibility.</p> <p>Discussion</p><p>To our knowledge, this is the first randomised controlled trial of an intervention specifically designed to prepare medical students for stressful clinical events. If effective, Thumos could potentially be adapted for medical students in other countries.</p> <p>Trial identifier and registry name</p><p>ISRCTN12744098: <a href="isrctn.com/ISRCTN12744098" target="_blank">isrctn.com/ISRCTN12744098</a>; An evaluation of a cognitive-behavioural intervention for medical students</p></div>