Table 6.

Regression equations between nine indexes based on surrogate data and HDRS scores.

Regression equation:	R-value	R2-value	p-Value
SEnRR = 0.0088 ∗ HDRS score + 1.7007	0.2235	0.0500	0.0649
SEnRes = 0.0091 ∗ HDRS score + 2.0622	0.1486	0.0221	0.2230
FMEnRR = 0.0132 ∗ HDRS score + 1.5142	0.2141	0.0458	0.0774
FMEnRes = 0.0014 ∗ HDRS score + 2.1243	0.0428	0.0018	0.7271
CSEn_4 = 0.0009 ∗ HDRS score + 0.6364	0.0549	0.0030	0.6540
CFMEn_4 = 0.0038 ∗ HDRS score + 0.3941	0.1887	0.0356	0.1205
CSEn_2 = 0.0038 ∗ HDRS score + 1.1060	0.1160	0.0135	0.3426
CFMEn_2 = 0.0072 ∗ HDRS score + 0.8102	0.2172	0.0472	0.0730
HF = 2.3120 ∗ HDRS score + 467.2489	0.0785	0.0062	0.5212