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End-tidal carbon dioxide (EtCO2) variables by AHI severity levels. The peak EtCO2 value was greater than 50 mmHg in 761 (86.9%) of screening polysomnograms. Test of linear trend of AHI severity P < 0.0001 for all categories. AHI, apnea-hypopnea index; TST, total sleep time.
