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The linear regression between AHI and LF/HF ratio of the four OSAS groups. The LF/HF ratio was affected by AHI (p<0.001), Stage 2 sleep (p=0.005) and age (p=0.021) in the order named in the stepwise multiple linear regression analysis. LF/HF raito: Low frequency/high frequency index, AHI: Apnea-Hyponea Index, OSAS: obstructive sleep apnea syndrome.
