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Table 1 Baseline data. N = 56

From: Oxygen treatment for cluster headache attacks at different flow rates: a double-blind, randomized, crossover study

Gender 61.1% male - 38.9% female
Age (median – range) 43.0 (20–76)
Current or past smoker 74.1% (50% current - 24.1% past)
Painfree periods (episodic) (N = 31) 67.7%
Pain between attacks 50.9%
Attack duration untreated (median-range) 60 min (9–330)
Attack frequency (median-range) 2 attacks per day (0.1–8)
Verapamil usage 55.4%