Table 2.

Within group effect sizes (Cohen’s d) of change in Behavioural Activation for Depression Scale (BADS) total scores from baseline to post-treatment, 1, 3, and 6 month follow-up

	Cohen’s d
	Post-treatment	1 month FU	3 month FU	6 month FU
BADS Total Score
Positive imagery condition	0.89	0.81	1.01	0.97
Control condition	0.71	0.60	0.38	0.96
BADS Subscales
Activation
Positive imagery condition	0.54	0.38	0.37	0.38
Control condition	0.14	0.31	0.11	0.39
Avoidance/rumination
Positive imagery condition	0.74	0.86	0.91	0.95
Control condition	0.55	0.37	0.26	0.81
Work/school impairment
Positive imagery condition	0.52	0.35	0.65	0.56
Control condition	0.46	0.51	0.31	0.45
Social impairment
Positive imagery condition	0.58	0.55	0.77	0.71
Control condition	0.48	0.15	0.18	0.53

Cohen’s d = (Baseline mean − mean at time i)/(√baseline variance)