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Relationship between indexes of apnea event and log PB% from the CPAP devices. PB%Device are plotted against their log AHI (a) and log CAI (b). Note the significant correlation between log PB%Device and log AHI (r = 0.562, p < 0.001), log CAI (r = 0.418, p < 0.001). PB, periodic breathing; CPAP, continuous positive airway pressure; AHI, apnea/hypopnea index; CAI, central/clear apnea index
