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. 2021 Apr 1;17(4):659–668. doi: 10.5664/jcsm.8992

Table 2.

OSA primary therapy device use over time (group A).

Observed Value Change from Baseline
Na Mean (SD) Median (Q1, Q3) na Mean (SD) Median (Q1, Q3)
Percentage of nightsb
 Baseline 235 90.0 (19.1) 100.0 (89.3, 100.0)
 Day 1 to week 2 248 89.0 (23.9) 100.0 (92.9, 100.0) 228 1.4 (13.3) 0.0 (0.0, 5.44)
 Week 3 to 14 234 87.1 (26.1) 98.9 (88.8, 100.0) 214 −0.5 (15.2) 0.0 (−1.2, 4.6)
 Week 15 to 27 212 88.2 (25.0) 100.0 (90.8, 100.0) 197 0.3 (13.0) 0.0 (−1.1, 4.55)
 Week 28 to 40c 186
  Week 28 to 40 68 89.2 (22.9) 100.0 (90.7, 100.0) 62 2.0 (12.3) 0.0 (0.0, 4.55)
  Week 30 to 40 118 89.5 (24.0) 100.0 (94.7, 100.0) 109 0.9 (12.4) 0.0 (0.0, 5.14)
No. of hours per nightd
 Baseline 147 6.6 (1.4) 6.6 (5.8, 7.4)
 Day 1 to week 2 138 5.9 (2.1) 6.4 (4.8, 7.4) 126 −0.7 (1.5) −0.4 (−1.2, 0.2)
 Week 3 to 14 134 5.7 (2.1) 6.1 (4.9, 7.1) 120 −1.0 (1.7) −0.6 (−1.5, 0.0)
 Week 15 to 27 116 5.9 (2.1) 6.2 (5.1, 7.2) 106 −0.9 (1.6) −0.5 (−1.5, 0.0)
 Week 28 to 40c 102
  Week 28 to 40 40 5.9 (2.1) 6.1 (5.2, 7.4) 34 −0.9 (1.4) −0.8 (−1.5, 0.0)
  Week 30 to 40 62 6.0 (2.0) 6.4 (5.4, 7.0) 58 −0.8 (1.7) −0.5 (−1.1, 0.2)
Percentage of nights OSA device was used more than half of nighte
 Baseline 89 90.4 (26.1) 100.0 (100.0, 100.0)
 Day 1 to week 2 111 91.5 (23.2) 100.0 (100.0, 100.0) 83 4.1 (16.8) 0.0 (0.0, 0.0)
 Week 3 to 14 100 94.5 (18.8) 100.0 (100.0, 100.0) 76 5.3 (19.3) 0.0 (0.0, 0.0)
 Week 15 to 27 95 92.7 (21.8) 100.0 (100.0, 100.0) 73 3.6 (19.9) 0.0 (0.0, 0.0)
 Week 28 to 40c 83
  Week 28 to 40 27 94.4 (19.7) 100.0 (100.0, 100.0) 22 6.2 (21.8) 0.0 (0.0, 0.0)
  Week 30 to 40 56 94.7 (18.9) 100.0 (100.0, 100.0) 42 6.5 (20.5) 0.0 (0.0, 0.0)

OSA = obstructive sleep apnea, Q1 = 25th percentile, Q3 =75th percentile, SD = standard deviation. aNo. of participants with nonmissing value at visit. bAmong all participants (with either electronically retrievable or diary data). cData for this period were summarized separately for participants who did not enter the randomized withdrawal phase (week 28 to 40) and for participants who entered the 2-week randomized withdrawal phase (week 30–40). dAmong participants with electronically retrievable data. eAmong participants with diary data.