“…This implies that reducing migraine symptoms will improve functioning, and indeed data have been supportive (e.g., Cortelli, Dahlöf, Bouchard, Heywood, Jansen, Pham, Hirsch, Adams, & Miller, 1997;Wells & Steiner, 2000). Conversely, factors that predict a long-term increase in migraine frequency would augur increased disability as well.…”