A Randomized Controlled Neurophysiological Study of a Chinese Chan-Based Mind-Body Intervention in Patients with Major Depressive Disorder

Table 2

Association between severity level of depression and frontal alpha asymmetry.

Subgroups of change in alpha asymmetry^a	Subgroups of change in severity level of depression^b		𝜒^2	E.S.
	Improved	Not improved
WL (𝑛=13)			1.040	0.28
Increased	1 (8%)	5 (39%)
Decreased	3 (23%)	4 (31%)
CBT (𝑛=14)			0.280	0.14
Increased	6 (43%)	3 (21%)
Decreased	4 (29%)	1 (7%)
DMBI (𝑛=14)			6.873**	0.70^++
Increased	9 (64%)	0 (0%)
Decreased	2 (14%)	3 (21%)

Note. WL: waitlist control; CBT: cognitive behavioral therapy; DMBI: Dejian mind-body intervention; E.S.: effect size as measured by Phi value.
^aSubgroups of change in alpha asymmetry are determined by the change in frontal alpha asymmetry from baseline to postintervention, where higher asymmetry level after intervention is considered as “Increased,” and vice versa.
^bSubgroups of change in severity level of depression are determined by the change in clinical classification based on the total score of Beck Depression Inventory from baseline to postintervention, where movement from more severe to less severe category after intervention is considered as “Improved”; otherwise, it is “Not Improved.”
** 𝑃<0.01; ⁺⁺large effect size.