Evaluate whether the benefits of Mindfulness-Based Cognitive Therapy for Migraine (MBCT-M) on headache disability differs among people with episodic and chronic migraine (CM). This is a planned secondary analysis of a randomized clinical trial. After a 30-day baseline, participants were stratified by episodic (6-14 d/mo) and CM (15-30 d/mo) and randomized to 8 weekly individual sessions of...