Additional file 4: of Diffusion tensor imaging in middle-aged headache sufferers in the general population: a cross-sectional population-based imaging study in the Nord-Trøndelag health study (HUNT-MRI) HusøyAndreas Kattem EikenesLive HåbergAsta HagenKnut StovnerLars 2019 Table S4. Number of individuals in each Fazeka’s grade in the different headache categories. (DOCX 15 kb)