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. 2012 Jan 25;9(1):65–72. doi: 10.4306/pi.2012.9.1.65

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Copyright © 2012 Korean Neuropsychiatric Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comparison of the LF/HF ratio between the four OSAS groups. The ratio was significantly different (F=4.64, p=0.004) when adjusted by systolic blood pressure (SBP), diastolic blood pressure (DBP), body mass index (BMI) and sleep efficiency (SE). The contrast test further showed that Group 1 was significantly different from Group 4 (p<0.001). Similarly, Group 3 was significantly different from Group 4 (p=0.040). OSAS: obstructive sleep apnea syndrome, LF/HF ratio: Low frequency/High frequency ratio.