Fig. 4

Changes in headache-management self-efficacy (SE) and chance-related locus of control (CMHLC-C) across the waiting-list phase and early follow-up. Values are shown at the waiting-list baseline (− 3 months), baseline at MMHT start (Day 1), end of MMHT (Day 5), and 3-month follow-up. Data are presented as mean ± standard error. Asterisks indicate statistically significant differences from the waiting-list baseline for SE; CMHLC-C showed only small, non-significant changes over time. MHLC-C subscales were assessed up to the 3-month follow-up to capture early psychological change proximal to the intervention.