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The linear regression between age and NN50 count of the four OSAS groups. The NN50 count was affected by age (p<0.001) and diastolic blood pressure (p=0.039) in the order named in the stepwise multiple linear regression analysis. LF: low frequency, HF: high frequency, NN50 count: the number of parts of adjacent RR intervals differing by more than 50 ms in the entire analysis interval, OSAS: obstructive sleep apnea syndrome.
