Table 1.

Descriptive statistics of instantaneous heartbeat dynamics features during the neutral elicitation task.

Feature	Statistics
	Healthy	Depressed	p-value
ipSampEn	0.286 ± 0.067	0.269 ± 0.023	0.970
ipApEn	0.345 ± 0.058	0.352 ± 0.046	0.447
μRR	761.62 ± 83.42	798.21 ± 61.57	0.447
σ2RR	319.11 ± 191.27	521.90 ± 187.03	0.442
LF	485.53 ± 253.45	763.60 ± 408.17	0.056
HF	321.12 ± 225.92	228.04 ± 109.43	0.799
LF/HF	1.818 ± 1.186	1.768 ± 0.862	0.817

p-values from the Mann–Whitney non-parametric test with null hypothesis of equal medians.