TABLE 3.
Growth curve model for estimates of Beck’s Depression Inventory scale, comparing three treatment groups vs. controls.
| Parameters | Unconditional | Level 1 | Level 2 | Cross level interaction |
| Fixed effects | ||||
| Intercept | 14.92(0.61)*** | 17.39(0.72)*** | 12.31(1.74)*** | 11.01(1.78)*** |
| Time | ||||
| Months, linear | −2.60(0.51)*** | −2.86(0.52)*** | −2.54(0.53)*** | |
| Months, quadratic | 0.39(0.11)*** | 0.44(0.11)*** | 0.46(0.11)*** | |
| Months, cubic | −0.02(0.01)** | −0.02(0.01)** | −0.02(0.01)** | |
| Treatment | ||||
| ABM + Control | 2.32(1.55)n.s. | 2.52(1.60)n.s. | ||
| Control + ACT | 6.15(1.59)*** | 8.82(1.75)*** | ||
| ABM + ACT | 7.37(1.42)*** | 9.98(1.51)*** | ||
| Higher education | −3.25(1.45)* | −3.27(1.43)* | ||
| Antidepressant treatment | 3.41(1.38)* | 3.31(1.37)* | ||
| Comorbidity | 4.39(1.03)*** | 4.45(1.01)*** | ||
| Interaction | ||||
| (ABM + Control) × Months, linear | −0.12(0.18)n.s. | |||
| (Control + ACT) × Months, linear | −0.80(0.17)*** | |||
| (ABM + ACT) × Months, linear | −0.77(0.18)*** | |||
| Random effects | ||||
| sd (Residuals) | 7.26 (0.32) | 5.18 (0.30) | 5.14 (0.31) | 5.13 (0.31) |
| sd (Intercept) | 8.53 (0.57) | 9.91 (0.60) | 8.50 (0.59) | 8.35 (0.57) |
| sd (Months, linear) | 4.99 (0.61) | 5.05 (0.63) | 5.03 (0.63) | |
| sd (Months, quadratic) | 0.96 (0.14) | 0.97 (0.14) | 0.98 (0.14) | |
| sd (Months, cubic) | 0.05 (0.01) | 0.05 (0.01) | 0.05 (0.01) | |
| Correlation (Months, linear; Intercept) | −0.37(0.11) | −0.38(0.10) | −0.36(0.10) | |
| Correlation (Months, linear; Months quadratic) | −0.97(0.01) | −0.97(0.01) | −0.97(0.01) | |
| Correlation (Months, linear; Months cubic) | 0.92 (0.03) | 0.92 (0.03) | 0.92 (0.03) | |
| Correlation (Months, quadratic; Intercept) | 0.30 (0.11) | 0.32 (0.11) | 0.30 (0.11) | |
| Correlation (Months quadratic, Months cubic) | −0.99(0.01) | −0.99(0.01) | −0.99(0.01) | |
| Correlation (Months, cubic; Intercept) | −0.28(0.11) | −0.29(0.11) | −0.29(0.11) | |
| Model summary | ||||
| Deviance statistic | 8,470.86 | 8,283.85 | 7,661.69 | 7,587.61 |
| Number of estimated parameters | 3 | 15 | 21 | 24 |
Robust standard errors in parentheses. n.s. – non-significant. ∗p < 0.05. ∗∗p < 0.01. ∗∗∗p < 0.001.