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Medians and quartile ranges (bars, vertical lines) of the apnea/hypopnea index (AHI) and the apnea/hypopnea related arousal index at 490 m and the 1st and the 3rd night at 4559 m. Only 11% and 4% of the apneas/hypopneas were followed by an arousal during the 1st and the 3rd nights, respectively. *P < 0.05 vs. 490 m, #P < 0.05 vs. the 1st night at 4559 m.
