Table 6 Results from the linear mixed-effects models from baseline to follow-up and between and within group effect sizes displayed in cohen’s d.

From: Prevention and treatment of social anxiety disorder in adolescents: mixed method randomised controlled trial of the guided online intervention SOPHIE

  

Coefficients from baseline to follow-up linear mixed-effects models (SOPHIE vs. CAU)

Effect sizes Cohen’s d [95% CI]

  

Estimates (SE)

t [CI]

p

Between-group

Within-group baseline follow-up

SOPHIE

CAU

SPIN

Intercept

7.48 (2.23)

3.36 [3.10; 11.85]

0.001

   
 

Follow-up

−7.37 (2.07)

−3.57 [−11.44; −3.31]

< 0.001

0.67 [0.32; 1.02]

1.17 [0.80; 1.54]

0.16 [−0.18; 0.50]

SPIN

Intercept

3.64 (2.85)

1.28 [−1.98; 9.25]

0.203

   

SAD

Follow-up

−3.55 (2.34)

−1.52 [−8.15; 1.06]

0.130

1.21[0.77; 1.65]

1.17 [0.73; 1.62]

0.85 [0.43; 1.28]

SPIN

Intercept

11.75 (4.04)

2.91 [3.74; 19.76]

0.004

   

subclinical

Follow-up

−17.00 (4.04)

−4.21 [−25.00; −8.99]

< 0.001

1.53 [0.82; 2.23]

1.37 [0.68; 2.05]

−0.28 [−0.90; 0.35]

PHQ-9

Intercept

2.55 (0.60)

4.28 [1.38; 3.73]

< 0.001

   
 

Follow-up

−0.82 (0.91)

−0.90 [−2.61; 0.96]

0.366

0.10 [−0.24; 0.44]

0.77 [0.42; 1.13]

0.63 [0.28; 0.97]

GAD-7

Intercept

2.03 (0.59)

3.42 [0.86; 3.19]

0.001

   
 

Follow-up

−1.02 (0.81)

−1.25 [−2.62; 0.58]

0.212

0.21 [−0.13; 0.55]

0.80 [0.44; 1.15]

0.57 [0.23; 0.92]

SAS-A

Intercept

13.00 (3.87)

3.36 [5.39; 20.62]

0.001

   
 

Follow-up

−3.17 (2.24)

−1.42 [−7.57; 1.23]

0.158

0.31 [−0.03; 0.65]

0.86 [0.50; 1.21]

0.61 [0.26; 0.95]

KIDSCREEN

Intercept

6.87 (2.24)

3.06 [2.46; 11.28]

0.002

   
 

Follow-up

1.09 (0.92)

1.18 [−0.72; 2.89]

0.239

−0.19 [−0.53; 0.15]

−1.40 [−1.78; −1.01]

−1.34 [−1.61; −0.86]

RSES

Intercept

7.00 (0.87)

8.02 [5.29; 8.72]

< 0.001

   
 

Follow-up

0.38 (0.58)

0.66 [−0.76; 1.53]

0.511

−0.13 [−0.47; 0.22]

0.20 [−0.15; 0.54]

0.21 [−0.13; 0.55]

GF social

Intercept

0.62 (0.25)

2.51 [0.14; 1.11]

0.012

   
 

Post-intervention

0.51 (0.11)

4.83 [0.31; 0.72]

< 0.001

−0.73 [−1.08; −0.37]

−0.52 [−0.87; −0.18]

0.35 [0.01; 0.70]

 

Follow-up

0.26 (0.12)

2.23 [0.03; 0.49]

< 0.001

−0.32 [−0.66; 0.02]

−0.41 [−0.76; −0.07]

0.08 [−0.26; 0.42]

GF role

Intercept

0.42 (0.16)

2.55 [0.10; 0.74]

0.011

   
 

Post-intervention

−0.08 (0.11)

−0.72 [−0.29; 0.14]

0.470

0.06 [−0.28; 0.40]

0.40 [0.06; 0.75]

0.09 [−0.25; 0.43]

 

Follow-up

−0.20 (0.12)

−1.66 [0.43; 0.04]

0.098

0.23 [−0.11; 0.57]

0.87 [0.51; 1.22]

0.15 [−0.19; 0.49]

ESAK

Intercept

−0.13 (2.10)

−0.06 [−4.27; 4.00]

0.949

   
 

Follow-up

−0.76 (1.51)

−0.50 [−3.72; 2.21]

0.616

0.10 [−0.24; 0.44]

0.48 [0.14; 0.83]

0.39 [0.05; 0.73]

  1. Notes. All linear mixed-effects models included the baseline value of investigated outcome value as a fixed covariate and a random effect of participants. SPIN = Social Phobia Inventory; PHQ-9 = 9-item version of the Patient Health Questionnaire; GAD-7: 7-item version of the Generalized Anxiety Disorder; SAS-A = Social Anxiety Scale for Adolescents; KIDSSCREEN = quality of life assessment KIDSCREEN-10; RSES = Rosenberg Self-esteem Scale; GF social: Global Functioning Scale, subscale social; GF role: Global Functioning Scale, subscale role; ESAK = Parents’ Questionnaire on Social Anxieties in Childhood and Adolescence.
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