Fig. 1

Patient selection. ^aMigraine diagnosis by ICD-10 code (ICD-10 G43.0, G43.1, G43.2, G43.3, G43.8, G43.9) supplemented by physician Chinese characters descriptions. ^bPatients with a migraine-related outpatient visit in January 2016 or January 2017 and with ≥11 months of follow-up were included in the outpatient cost analysis. CHIRA: China Health Insurance Research Association; ICD: International Statistical Classification of Diseases and Related Health Problems