Table 3.

Within- and between-group effect sizes for all groups in the intention-to-treat sample.

Measure and group			Within group, Cohen d (95% CI)				Between group (vs unguided), Cohen d (95% CI)					Between group (vs control), Cohen d (95% CI)
			T1a–T2b		T1–T3c		T2		T3		T2			T3
Beck Depression Inventory II
	Guided	1.15 (0.91, 1.40)		1.44 (1.21, 1.68)		0.24 (0.02, 0.48)		0.20 (−0.04, 0.45)		1.25 (0.99, 1.54)			1.63 (1.37, 1.93)
	Unguided	0.98 (0.75, 1.25)		1.38 (1.15 1.65)		—d		—		0.92 (0.65, 1.20)			1.47 (1.22, 1.73)
	Control	0.20 (−0.09, 0.47)		0.07 (−0.21, 0.37)		—		—		—			—
Quick Inventory of Depressive Symptomatology – Self Report
	Guided	1.07 (0.84, 1.33)		1.94 (1.68, 2.24)		0.11 (−0.10, 0.33)		0.16 (−0.06, 0.39)		1.29 (1.02, 1.53)			2.61 (2.28, 3.02)
	Unguided	1.52 (1.28, 1.80)		2.32 (1.95, 2.72)		—		—		1.26 (1.04, 1.53)			2.36 (1.98, 2.82)
	Control	0.33 (0.05, 0.63)		0.13 (−0.14, 0.45)		—		—		—			—
Hamilton Rating Depression Scale
	Guided	N/Ae		1.76 (1.50, 2.05)		N/A		0.45 (0.21, 0.70)		N/A			1.24 (0.93, 1.59)
	Unguided	N/A		1.34 (1.10, 1.61)		—		—		N/A			0.89 (0.62, 1.21)
	Control	N/A		0.20 (−0.08, 0.48)		—		—		—			—
Beck Anxiety Inventory
	Guided	0.67 (0.44, 0.93)		1.35 (1.10, 1.64)		−0.13 (−0.37, 0.11)		0.241 (0.01, 0.46)		1.28 (1.04, 1.55)			1.87 (1.61, 2.20)
	Unguided	0.99 (0.73, 1.25)		1.21 (0.94, 1.51)		—		—		1.56 (1.28, 1.86)			1.52 (1.25, 1.84)
	Control	−0.50 (−0.79, −0.22)		−0.27 (−0.55, 0.01)		—		—		—			—

^aT1 represents the start of the study.

^bT2 represents the midpoint of the intervention (6 weeks after the start of the study)

^cT3 represents the end of the intervention (12 weeks after the start of the study).

^dNo data.

^eNot available because the Hamilton Rating Depression Scale was not used at the midpoint assessment.