Comparison of cardiac autonomic function test (supine) parameters between NFG and IFG group.

Data are expressed as Mean ± standard deviation; LF, low frequency spectral power; HF, high frequency spectral power; TP, total spectral power; nu, normalized units; HRV, heart rate variability; RR, R to R wave; SD, standard deviation; RMSSD–root mean square of successive standard deviation of RR interval; NN50, consecutive R to R interval differs more than 50 ms; p, percentage; HRFTB, HR difference during forced timed breathing; 30/15 ratio, ratio of longest to shortest RR interval in response to orthostatic stress; HRVAL, heart rate difference during and after Valsalva maneuver; VCR, vasoconstrictor reserve. p-value