Table 4

Overall, mild and moderate sample. Changes in the BDI within and between the intervention and usual care group with missing data replaced using last value carried forward
Usual care group (n=112) Intervention group (n=119) Difference (95% CI) between groups (intervention group -usual care group)**
Sample Months mean (SD) Difference* (95% CI) SRM# mean (SD) Difference*(95% CI) SRM# Difference P-value SES$
Pre-intervention 19.62 (5.79) 20.90 (5.68)
3 (Post-intervention) 17.54 (7.18) 2.07 (1.0 to 3.1) 0.36 15.42 (7.53) 5.47(4.19 to 6.76) 0.77 −2.12 (−4.03 to −0.214) 0.029 0.29
Overal 6 16.51 (7.60) 3.1 (1.7 to 4.4) 0.43 15.37 (8.74) 5.52 (3.9 to 7.08) 0.64 −1.13 (−3.27 to 0.992) 0.293 0.15
9 16.35 (7.84) 3.26 (1.9 to 4.6) 0.44 15.09 (8.62) 5.8 (4.3 to 7.26) 0.72 −1.25 (−3.39 to 0.886) 0.249 0.16
Usual care group (n=48) Intervention group(n=37)
Pre-intervention 14.08 (2.72) 13.81 (2.50)
Mild 3 (Post-intervention) 13.23 (5.57) 0.85 (−0.56 to 2.2) 0.17 10.38 (4.94) 3.43(1.81 to 5.04) 0.71 −2.85 (−5.16 to −0.542) 0.016 0.51
6 13.15 (6.02) 0.93 (−0.78 to 2.65) 0.15 10.65 (5.46) 3.16 (1.15 to 5.16) 0.52 −2.50 (−5.015 to 0.200) 0.052 0.42
9 12.27 (5.78) 1.81 (0.06 to 3.56) 0.30 9.70 (5.93) 4.11 (2.17 to 6.04) 0.70 −2.57 (−5.114 to −0.220) 0.048 0.44
Usual care group (n=64) Intervention group(n=82)
Pre-intervention 23.77 (3.6) 24.10 (3.31)
Moderate 3 (Post-intervention) 20.8 (6.6) 2.99 (1.45 to 4.51) 0.49 17.7 (7.4) 6.40(4.71 to 8.09) 0.83 −3.08 (−5.41 to −0.762) 0.010 0.47
6 19.00 (7.7) 4.74 (2.86 to 6.60) 0.63 17.5 (9.1) 6.60 (4.54 to 8.65) 0.70 −1.53 (−4.35 to 1.28) 0.285 0.20
9 19.4 (7.8) 4.36 (2.35 to 6.36) 0.54 17.50 (8.6) 6.58 (4.63 to 8.50) 0.74 −1.89 (−4.60 to 0.840) 0.174 0.24

Abbreviations: SD standard deviation; CI confidence interval.

* Differences were calculated between baseline measurement and follow-up measurement.

Positive differences indicate improvement; a negative one denotes some worsening on clinical measures.

# SRM: Standardized response mean. Calculated as the mean change in score divided by the standard deviation of the change in score.

$ SES: Standardized effect size was computed as the mean difference between intervention and control group divided by the standard deviation of the control measurement.

A positive SRM or SES denotes improvement; a negative one denotes some worsening on clinical measures.

** Difference was calculated between intervention group and control group.

Negative differences indicate improvement in the intervention group; Positive differences denote worsening in the intervention group.

Interpretation effect sizes: Values 0.2-0.5 represent small changes, 0.5-0.8 moderate changes and >0.8 large changes.

Casañas et al.

Casañas et al. BMC Psychiatry 2012 12:230   doi:10.1186/1471-244X-12-230

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