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Total air leak during continuous positive airway pressure titration via nasal and oronasal mask (without mandibular advancement device). While leak was continuously available during polysomnography (PSG) titration on the Omnilab (Philips-Respironics, USA) system, it was not recorded as part of the PSG. Rather, it was documented intermittently as a comment; hence, it is not available for all subjects for all pressure levels
