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. 2014 Oct 12;9(1):53–62. doi: 10.1007/s11571-014-9313-1

Table 2.

Bivariate correlations [and 95 % Confidence Intervals] between depressive symptoms (assessed by BDI-II), brooding and suppression and scaling exponents of EEG signals in the subclinically depressed and the non-depressed groups

Broad band scaling exponents Theta band scaling exponents Alpha band scaling exponents
C3C4 P3P4 P3P4 T7T8 C3C4 F3F4 O1O2 T7T8
Brooding
SBD .195
[−.192, .530]		 .366a,*
[−.008, .650]		 .329*
[−.050, .625]		 −.349a,*
[−.639, .028]		 −.339*
[−.632, .039]		 −.495**
[−.733, −.150]		 −.295
[−.602, .088]		 −.105
[−.460, .279]
ND −.055
[−.257, .152]		 −.031a
[−.234, .175]		 .012
[−.193, .216]		 −.102a
[−.301,.105]		 .096
[−.111, .295]		 .046
[−.160, .248]		 .105
[−.102, .303]		 .166
[−.040, .359]
Z score 1.104 1.754 1.400 −1.091 −1.922 −2.390* −1.767 −1.197
Suppression
SBD .388*
[.017, .665]		 .382a,*
[.010, .661]		 .090
[−.293, .448]		 −.330*
[−.626, .049]		 −.041
[−.408, .337]		 −.270
[−.584, .115]		 −.325*
[−.623, .055]		 −.254
[−.573, .132]
ND −.069
[−.270, .138]		 −.0461
[−.248, .160]		 −.023
[−.227, .183]		 −.142
[−.337, .065]		 .010
[−.195, .214]		 −.012
[−.216, .193]		 .070
[−.137, .271]		 .062
[−.145, .263]
Z score 2.019* 1.891 .499 −.831 −.225 −1.140 −1.745 −1.396
Depressive symptoms .444**
[.085, .701]		 .490**
[.143, .730]		 .429*
[.067, .691]		 .091
[−.292, .449]		 −.526**
[−.752, −.190]		 −.566**
[−.775, −.245]		 −.443**
[−.700, −.084]		 −.324*
[−.622, .056]

Scaling exponents measured by DFA at broad band (1–40 Hz), theta (3–7 Hz), and alpha (8–13 Hz) and at central (average C3C4), parietal (average P3P4), occipital (average O1O2) and temporal (average T7T8) cortex. Fisher r-to-z transformation for correlation comparison between SBD and ND groups

SBD subclinically depressed, ND non-depressed

* p < .05; ** p < .01

aOnly in one eyes-closed condition