Table 1 RCT group comparison on demographics and baseline assessment measures

Demographic & Diagnostic info

  Adolescent age (years)

14.65 (1.51)

14.48 (1.62)

.55

.58

  Adolescent sex (m:f)

39:15

34:18

.58

.45

  Parent age (years)

47.81 (6.90)

47.15 (6.24)

.52

.61

  Parent sex (m:f)

12:42

11:41

.02

.89

  SRS-2 score Parents

57.46 (12.40)

56.22 (12.05)

.50

.62

  Usage of psychiatric medication (yes:no)

22:31

23:29

.08

.78

  Previous social skills training (yes:no)

34:20

30:21

1.24

54

  WISC/ WASI Total

101.47 (20.68)

103.98 (12.40)

-.67

.50

  WISC/ WASI Performance

103.28 (14.62)

107.07 (10.65)

.21

.83

  WISC/ WASI Verbal IQ

100.88 (16.84)

100.15 (14.99)

-1.35

.18

  ADOS-2 CSS

5.31 (2.54)

5.77 (2.39)

-.81

.42

Process information

  Compliance Attendance

A:89.35%

P:87.01%

A: 83.28%

-1.90

.06

  Compliance Homework

A:74.86%

P:70.78%

A: 68.55%

-1.60

.11

  Fidelity

A: 92.87% (6.17)

P: 97.52% (2.81)

A: 92.63% (6.72)

-.08

.90

  Group dynamics – Problematic disturbances, % of participants involved (i.e. externalizing/aggressive behaviors) during more than 2 group sessions

7.3%

12.8%

.14

.16

  Treatment Satisfaction (Parent)

8.20 (1.46)

7.52 (1.45)

1.97

.05*

  Treatment Satisfaction (Adolescent)

7.51 (1.67)

7.28 (2.46)

.51

.61

(n = 48) M (SD)

(n = 41) M (SD)

  CASS total confederates

37.41 (5.01)

36.98 (4.27)

.44

.66

  CRS total confederates

26.23 (5.77)

23.67 (5.71)

2.23

.03*

T1 Adolescent measures

  SSIS-A total

84.31 (20.45)

85.51 (16.43)

-.33

.74

  CASS total

30.13 (8.22)

28.91 (7.10)

.75

.46

  CRS-A total

27.45 (4.46)

25.60 (4.77)

2.01

.04*

T1 Parent measures

  SRS-2-P total

88.90 (27.09)

86.20 (22.02)

.56

.58

  SSIS-P total

70.26 (18.49)

73.20 (16.35)

-.86

.39

T1 Teacher measures

n = 37

n = 31

  SRS-2-T total

77.92 (24.51)

73.94 (26.71)

.64

.52

  SSIS-T total

69.90 (17.98)

71.59 (15.76)

-.42

.67