Table 1.
Positive airway pressure usage over the first 90 days of therapy, by country.
| Adherence Variables (in first 90 days) | Brazil (n = 31,672) | Mexico (n = 16,934) | United States (n = 4,132,884) | P Value |
|---|---|---|---|---|
| CMS adherence achieved, n (%) | 22,702 (71.7) | 11,251 (66.4) | 3,057,187 (74.0) | < .001b |
| Days to achieve CMS adherence, days | ||||
| Mean ± SD | 28.48 ± 12.41 | 29.20 ± 13.63 | 28.08 ± 12.81 | < .001c |
| Median (IQR) | 24.0 (22.0, 28.0) | 24.00 (22.0, 29.0) | 23.0 (21.0, 28.0) | < .001d |
| Proportion of days with nonzero usage, % | ||||
| Mean ± SD | 79.7 ± 24.1 | 74.3 ± 28.5 | 80.0 ± 26.6 | < .001c |
| Median (IQR) | 90.0 (70.0, 97.8) | 86.7 (57.8, 97.8) | 93.3 (71.1, 98.9) | < .001d |
| Proportion of days adherent (usage ≥ 4 h), % | ||||
| Mean ± SD | 67.0 ± 29.4 | 60.7 ± 33.9 | 67.5 ± 32.5 | < .001c |
| Median (IQR) | 75.6 (47.8, 92.2) | 71.1 (31.1, 91.1) | 80.0 (45.6, 95.6) | < .001d |
| Average usage per session, ha | ||||
| Mean ± SD | 5.91 ± 1.61 | 5.75 ± 2.05 | 5.98 ± 2.03 | < .001c |
| Median (IQR) | 6.07 (5.01, 6.97) | 6.01 (4.58, 7.12) | 6.18 (4.77, 7.36) | < .001d |
| Average daily usage across all days, h | ||||
| Mean ± SD | 4.90 ± 2.15 | 4.59 ± 2.55 | 5.13 ± 2.56 | < .001c |
| Median (IQR) | 5.23 (3.47, 6.50) | 4.93 (2.53, 6.56) | 5.52 (3.37, 7.04) | < .001d |
CMS = Centers for Medicare and Medicaid, IQR = interquartile range, SD = standard deviation. aTotal usage over 90 days/days with usage > 0; bchi-square test; canalysis of variance test; dKruskal–Wallis test.