Table 2.

Descriptive statistics of Instantaneous Heartbeat Dynamics features during the Emotional elicitation task.

Feature	Statistics
	Healthy	Depressed	p-value
ipApEn	0.361 ± 0.038	0.316 ± 0.041	0.016
ipSampEn	0.298 ± 0.052	0.257 ± 0.041	0.212
μRR	809.17 ± 102.25	792.40 ± 84.05	0.328
σ2RR	596.71 ± 367.11	402.30 ± 209.61	0.093
LF	674.08 ± 417.99	616.29 ± 391.82	0.777
HF	518.34 ± 284.61	328.63 ± 214.38	0.054
LF/HF	1.068 ± 0.591	1.987 ± 0.751	0.095

Bold indicates statistically significant indices.

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