Figure 1.

Selection of the ZIP code tabulation areas (ZCTAs) included in the analyses of neighborhood demographics and continuous positive airway pressure (CPAP) adherence. Zip codes from all individuals initiated on CPAP therapy in the Philips Encore database between November 1, 2015, and October 31, 2018, were mapped onto ZCTAs. The analyses between neighborhood demographics and CPAP use included ZCTAs belonging to the 50 U.S. states and the District of Columbia with at least 100 adult residents, available poverty data, and at least one CPAP user in the database. The sensitivity analyses included only ZCTAs with more than 10 CPAP users.