Enduring effects of a 5-week behavioral activation program for subthreshold depression among late adolescents: an exploratory randomized controlled trial

Figures & data

Figure 1 Study flow chart.

Abbreviations: BDI-II, Beck Depression Inventory, second edition; CIDI, Composite International Diagnostic Interview; ITT, intention-to-treat.

Table 1 Descriptive data of groups

Characteristics	Intervention group	Control group	P-value
	n=62	n=56
Female/male	24/38	21/35	1.00
Mean age (years)	18.23 (0.42)	18.20 (0.40)	0.70
Live alone/live with family	48/14	43/13	1.00
Enter the university of first choice	33/29	33/23	0.66
Lifetime diagnosis of major depressive disorder (yes/no)	5/57	8/48	0.43
Comorbidity
Diagnosis of any anxiety disorder in the previous year (yes/no)	7/55	14/42	0.09
BDI-II (pretreatment)	12.76 (6.66)	13.30 (5.95)	0.64

Note: Values in parentheses represent SD.

Abbreviation: BDI-II, Beck Depression Inventory, second edition.

Table 2 Results of linear mixed model

Intention-to-treat analysis
Score	Time	Intervention group (n=62)	Control group (n=56)	95% CI	P-value
		Estimate (SE)	Estimate (SE)
BDI-II	Pretreatment	12.76 (0.83)	13.30 (0.88)	-2.93 to 1.89	0.65
	Posttreatment	7.03 (0.84)	12.77 (0.88)	3.34 to 8.14	0.00
	1-year follow-up	11.00 (0.89)	13.83 (0.91)	0.28 to 5.33	0.03
Complete case analysis
Score	Time	Intervention group (n=51)	Control group (n=49)	95% CI	P-value
		Estimate (SE)	Estimate (SE)
BDI-II	Pretreatment	12.63 (0.93)	13.18 (0.96)	-2.06 to 3.18	0.65
	Posttreatment	6.45 (0.93)	12.77 (0.96)	3.75 to 8.99	0.00
	1-year follow-up	10.77 (0.93)	13.83 (0.96)	0.39 to 5.63	0.03

Note: Values in parentheses are SEs.

Abbreviations: BDI-II, Beck Depression Inventory, second edition; SE, standard error.

Figure 2 Changes in BDI-II score from pretreatment to 1-year follow-up.

Abbreviation: BDI-II, Beck Depression Inventory, Second edition.

Figure 3 Survival curve.

Notes: Survival times are shown for three times. Time 1 is 7–12 months before the 1-year follow-up period. Time 2 is 2–6 months before the 1-year follow-up period. Time 3 is within 1 month from the 1-year follow-up period.