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Figure 1: Comparison of continuous variable among groups. NA, No headache; Chr MO, Chronic migraine without aura; MA, Migraine with aura; Chr MA, Chronic migraine with aura; EITTH, Episodic infrequent tension - type headache; CTTH, Chronic tension - type headache; PMOH, Probable medication overuse headache; unspecified, unspecified headache

Figure 1: Comparison of continuous variable among groups. NA, No headache; Chr MO, Chronic migraine without aura; MA, Migraine with aura; Chr MA, Chronic migraine with aura; EITTH, Episodic infrequent tension - type headache; CTTH, Chronic tension - type headache; PMOH, Probable medication overuse headache; unspecified, unspecified headache