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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

From: Effectiveness of a psycho-educational group program for major depression in primary care: a randomized controlled trial

 

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

  1. Abbreviations: SD standard deviation; CI confidence interval.
  2. * Differences were calculated between baseline measurement and follow-up measurement.
  3. Positive differences indicate improvement; a negative one denotes some worsening on clinical measures.
  4. # SRM: Standardized response mean. Calculated as the mean change in score divided by the standard deviation of the change in score.
  5. $ SES: Standardized effect size was computed as the mean difference between intervention and control group divided by the standard deviation of the control measurement.
  6. A positive SRM or SES denotes improvement; a negative one denotes some worsening on clinical measures.
  7. ** Difference was calculated between intervention group and control group.
  8. Negative differences indicate improvement in the intervention group; Positive differences denote worsening in the intervention group.
  9. Interpretation effect sizes: Values 0.2-0.5 represent small changes, 0.5-0.8 moderate changes and >0.8 large changes.