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Mixed models findings: Group and time (study phase) differences in apnea-hypopnea index (AHI) and percent of sleep time spent below 90% O2 saturation (%time SaO2 < 90%) between patients with Parkinson disease in the therapeutic CPAP (tCPAP) and placebo CPAP (pCPAP) groups at baseline, at 3 w of treatment (either with tCPAP or pCPAP), and at 6 w (all receiving tCPAP at this time). Bars represent standard error of the mean.
