Field testing the diagnostic criteria of cluster headache in the third edition of the International Classification of Headache Disorders: A cross

*These authors are shared first authors. Consecutive patients with CH and probable cluster headache (PCH) were prospectively recruited from 15 hospitals. We analysed the validity of the revised ICHD-3 criteria for CH against the beta version of the third edition of the ICHD (ICHD-3β). In total, 193 patients were enrolled: 140 (72.5%), 5 (2.6%) and 22 (11.4%) had episodic cluster headache (ECH), CCH, and PCH, respectively. The remaining 26 (13.5%) had CH with undetermined remission periods. One patient with ECH and one with PCH had only forehead and facial flushing and were diagnosed with PCH and non-cluster headache, respectively, according to the ICHD-3. Four participants with ECH according to the ICHD-3β had remission periods of？>？1 month and between 1 and 3 months and were newly diagnosed with CCH according to the ICHD-3. The change from ICHD-3β to ICHD-3 resulted in few differences in the diagnoses of CH and PCH