Table 1. Characteristic parameters of the IBI spectrum during the controlled breathing test in the frequency domain.

	Peak position	RP	LF	HF	LF/HF	rf	β
Control subjects	0.09±0.01	0.13±0.05	0.24±0.09	0.12±0.06	2.3±0.8	0.3±0.1	0.4±0.1
Recently- diagnosed DM patients	0.08±0.01	0.06±0.03	0.15±0.06	0.07±0.04	2.6±0.9	0.17±0.07	0.26±0.08
Long-standing DM patients	0.06±0.01	0.01±0.02	0.09±0.06	0.04±0.03	2.2±0.9	0.09±0.06	0.08±0.06