Table 2.

Analysis of non-linear HRV features

HRV features	Healthy subject (n = 35)	T2DM subject (n = 100)	p-Value
SD1	38.22 ± 19.34	24.83 ± 13.40	0.0001#
SD2	87.63 ± 34.06	44.97 ± 16.72	0.0001#
SDR	0.43 ± 0.14	0.56 ± 0.19	0.0002#
DFA-α1	0.92 ± 0.20	0.85 ± 0.22	0.2543
DFA-α2	0.92 ± 0.23	0.90 ± 0.18	0.4130
Alpha ratio	1.07 ± 0.42	0.97 ± 0.32	0.2804
AppEN	1.12 ± 0.15	1.16 ± 0.19	0.1976
SampEN	1.40 ± 0.30	1.43 ± 0.32	0.6549