Table 2

Sleep study parameters between CPAP and PT

CPAPPTAdjusted mean difference*P value
Total AHI, events/hour4.0±3.213.0±13.88.8 (4.1 to 13.6)0.001
NREM AHI, events/hour3.9±3.811.0±13.76.9 (2.1 to 11.7)0.006
REM AHI, events/hour4.6±4.121.8±19.716.9 (9.8 to 24.0)<0.001
Supine AHI, events/hour5.9±7.218.5±24.412.5 (4.3 to 20.7)0.004
Non-supine AHI, events/hour2.6±4.313.5±16.910.9 (4.7 to 17.1)0.001
% total sleep time SaO2 <90%0.2±0.81.1±2.60.9 (−0.05 to 1.8)0.063
ODI 3%, events/hour0.8±0.95.9±10.55.0 (1.3 to 8.6)0.009
Nadir SaO2,%90.2±4.186.1±7.6−4.0 (−6.8 to −1.3)0.005
Total sleep time393.1±66.9402.1±57.29.5 (−12.9 to 31.8)0.394
Supine sleep time251.2±109.775.1±104.2−171.8
(−215.6 to −128.1)
<0.001
Sleep efficiency (%)82.9±12.185.4±9.32.6 (−1.8 to 6.9)0.239
Wake after sleep onset (min)55.2±40.041.8±30.4−13.5 (−29.4 to 2.4)0.094
Sleep onset latency
(min)
26.1+54.226.6+35.4−0.1 (−13.9 to 13.7)0.991
N3, % total sleep time16.3±7.213.3±8.2−3.0 (−6.1 to 0.1)0.056
REM, % total sleep time20.7±6.619.7±6.6−0.9 (−3.7 to 1.9)0.528
Arousal index12.6±7.28.4±4.1−4.3 (−6.5 to −2.1)<0.001
  • *Multivariate model was adjusted to gender, age, race, BMI, randomisation sequence, baseline ESS, baseline AHI, baseline of the respective outcome measure, device’s adherence and device*randomisation sequence.

  • AHI, Apnoea-Hypopnoea Index; CPAP, continuous positive airway pressure ; N3, Stage 3NREM Sleep; NREM, non-rapid eye movement; ODI, Oxygen Desaturation Index; PT, positional therapy; REM, rapid eye movement; SaO2, oxygen saturation.