Table 3.

Regression equations between nine indexes based on physiological series and HDRS scores.

Regression equation:	R-value	R2-value	p-Value
SEnRR = 0.0074 ∗ HDRS score + 1.5178	0.1735	0.0301	0.1539
SEnRes = -0.0013 ∗ HDRS score + 2.0002	-0.0181	0.0003	0.8825
FMEnRR = 0.0139 ∗ HDRS score + 1.4062	0.2406	0.0579	0.0465*
FMEnRes = -0.0006 ∗ HDRS score + 2.0147	-0.0132	0.0002	0.9141
CSEn_4 = 0.0047 ∗ HDRS score + 0.5933	0.2609	0.0681	0.0304*
CFMEn_4 = 0.0071 ∗ HDRS score + 0.3471	0.3138	0.0985	0.0086**
CSEn_2 = 0.0166 ∗ HDRS score + 1.0253	0.2822	0.0797	0.0188*
CFMEn_2 = 0.0138 ∗ HDRS score + 0.7704	0.3004	0.0902	0.0122*
HF = 5.6808 ∗ HDRS score + 121.5968	0.1494	0.0223	0.2206

^∗Significant correlation with p < 0.05. ^∗∗Significant correlation with p < 0.01.