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Total number of days with Positive Airway Pressure usage

How many nights do you use the device during an average week?

On nights that you use the device, how many hours do you usually use it?

Computed as the total time of Continuous Positive Airway Pressure (CPAP) use divided by the total number of days in the interval. Follow-up periods of 30 days were used at Month 1 and Month 3.

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) Berry RB et al. 2012 (PubMed ID:23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.]. Search for all AHI variables consistent with the same clinical guidelines within this dataset

Subscore based on 1 item from Pittsburgh Sleep Quality Index, with a range of 0-3. A score of "0" indicates no difficulty, while a score of "3" indicates severe difficulty. Buysse et. al 1989 (PubMed ID: 2748771)External semantic reference: CDE Search for all PSQI variables within this dataset Source: :psqi_6:

Item from Pittsburgh Sleep Quality Index. Buysse et. al 1989 (PubMed ID: 2748771)External semantic reference: CDEOriginal text: The following questions relate to your usual sleep habits during the past month only. Your answers should indicate the most accurate reply for the majority of days and nights in the past month. During the past month, how often have you taken medicine to help you sleep (prescribed or over the counter)? Search for all PSQI variables within this dataset