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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Expert Rev Respir Med. 2019 Feb 15;13(5):407–415. doi: 10.1080/17476348.2019.1577732

Figure 1.

Figure 1

Proportion of patients with chronic obstructive pulmonary disease who received various respiratory devices or did not receive such positive airway pressure (PAP) therapy are shown by regions in the United States. There was significant geographic variability in the prescription of various therapies. CPAP=continuous positive airway pressure therapy; Bilevel PAP = Bilevel positive airway pressure therapy; and NIPPV= Noninvasive positive airway pressure therapy. Reproduced with permission from American Journal of Medicine[21].