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Sleep indices by visit for prior PAP-treated (a) and PAP-naïve (b) subgroups. Median sleep indices from centrally scored in-laboratory polysomnogram displayed by visit for the prior mask use (left) and no prior mask use subgroups (right). *Paired change from baseline p value <.001. AHI apnea-hypopnea index, ArI arousal index, CAI central apnea index, OAI obstructive apnea index, ODI4 4% oxygen desaturation index, PAP positive airway pressure
