TABLE 4.

Growth curve model for estimates of the Hamilton Depression Rating Scale, comparing three treatment groups vs. controls.

Parameters	Unconditional	Level 1	Level 2	Cross level interaction
Fixed effects
Intercept	8.30(0.30)***	9.22(0.33)***	6.59(0.67)***	6.12(0.69)***
Time
Months, linear		−0.64(0.11)***	−0.67(0.11)***	−0.49(0.12)***
Months, quadratic		0.04(0.01)***	0.04(0.01)***	0.04(0.01)***
Treatment
ABM + Control			0.87(0.76)n.s.	0.68(0.78)n.s.
Control + ACT			0.70(0.80)n.s.	1.95(0.86)*
ABM + ACT			0.46(0.77)n.s.	1.35(0.81)n.s.
Antidepressant treatment			1.87(0.69)**	1.82(0.69)**
Comorbidity			2.63(0.55)***	2.66(0.55)***
Interaction
(ABM + Control) × Months, linear				0.03(0.10)n.s.
(Control + ACT) × Months, linear				−0.47(0.10)***
(ABM + ACT) × Months, linear				−0.34(0.10)**
Random effects
sd (Residuals)	4.32 (0.16)	3.92 (0.15)	3.90 (0.16)	3.90 (0.16)
sd (Intercept)	4.20 (0.28)	4.19 (0.29)	3.95 (0.29)	3.92 (0.28)
sd (Months, linear)		0.34 (0.04)	0.34 (0.04)	0.27 (0.05)
Correlation (Months, linear; Intercept)		−0.09(0.11)	−0.16(0.13)	−0.18(0.12)
Model summary
Deviance statistic	7,256.92	7,182.11	6,972.69	6,933.42
Number of estimated parameters	3	7	12	15

Robust standard errors in parentheses, n.s. – non-significant. ^∗p < 0.05. ^∗∗p < 0.01. ^∗∗∗p < 0.001.