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. 2017 Mar 30;32(6):893–899. doi: 10.3346/jkms.2017.32.6.893

Fig. 1.

Fig. 1

Steps of the proposed method.

OSA = obstructive sleep apnea, PP = pulse-to-pulse interval, SDPP = standard deviation of the pulse-to-pulse interval, rMSSD = root mean square of successive differences, LF = low-frequency, HF = high-frequency, SI = snoring index, SVM = support vector machine.