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Teo et al randomized 24 people with newly diagnosed obstructive sleep apnea (AHI > 15) to crossover between nasal and oronasal (full-face) masks during 2 consecutive nights of CPAP titration. The nasal mask had more leaks and people wearing it had more arousals. However, they liked it better than the face mask, and there was no difference in pressures required to abolish obstructive apneas. Sleep 2011;34(7):951-955.