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. Author manuscript; available in PMC: 2019 Mar 27.
Published in final edited form as: Eur Respir J. 2018 Sep 27;52(3):1800674. doi: 10.1183/13993003.00674-2018

FIGURE 1.

FIGURE 1

Effect of supplemental oxygen on primary and secondary outcomes in responders (n=9) and non-responders (n=27). a) In responders, improvements were observed in the apnoea–hypopnoea index (AHI) by definition. In addition, responders exhibited improvements in b) the frequency of arousals from sleep (arousal index) as well as in c, d) blood pressure (change from evening to morning) and e) subjective sleep quality. Subjective sleep quality was scored as follows: 1=slept better; 0=slept the same; −1=slept worse. There was no effect on the Stanford Sleepiness Scale (subjective morning alertness, not shown). Error bars indicate SEM. SBP: systolic blood pressure; DBP: diastolic blood pressure. #: oxygen versus sham; : responders versus non-responders.