Fig. 2 (abstract P149).

Multivariate analysis using random forest showing sorted variable importance (VI) mean VI (on the X-axis) of all variables recorded , in descending order (on the y-axis). The red line is the threshold value. Only five items were above the line but with minor significance, of no clinical relevance (VI mean < 0.002). Variables legend: V2: Current age, V3: Gender, V5: Age of Onset, V6: Episodic CH, V7: Chronic CH, V8: Probable CH , V9: Strictly Unilateral, V10: Side Variable, V11: Bilateral, V12: Site RetroOrbital,V13: Site Orbital, V14: Site Frontal, V15: Site Temporal, V16: Site Parietal, V17: Site Vertex, V18: Site Occiput, V19: Site Nasal, V20: Absence of dysautonomic feature, V21: Ptosis, V22: Eye Oedema, V23: Conjonctival injection, V24: Miosis, V25: Lacrimation, V26: Nasal Blockage, V27: Rhinorrea, V28: Sweating, V29: Facial Flush, V30: Aural Fullness, V31: Restlessness, V32: Average attack frequency per day, V33: Minimum attack frequency per day V34: Maximum attack frequency per day, V35: Average Attack Duration, V36: Minimum Attack Duration, V37: Maximum Attack Duration, V39: Intractable to Acute treatment, V40: Intractable to Preventive treatment, V41: Follow-up duration