Multidimensional family therapy decreases the rate of externalising behavioural disorder symptoms in cannabis abusing adolescents: outcomes of the INCANT trial

Table 1 Observed sample sizes, means, and standard deviations for self- and parent-reported internalising and externalising symptoms and for family functioning

Outcome measure	Intake M (SD)	6 Month M (SD)	9 Month M ( SD)	12 Month M ( SD)
YSR Internalising	n = 430	n = 346		n = 382
MDFT	14.59 (9.75)	10.96 (7.77)	N/A	10.82 (8.87)
IP	14.60 (9.56)	11.99 (8.71)	N/A	11.76 (9.23)
YSR Externalising	n = 430	n = 346		n = 382
MDFT	21.57 (9.22)	17.08 (8.61)	N/A	15.38 (9.07)
IP	19.73 (8.32)	17.12 (9.21)	N/A	15.86 (8.80)
CBCL Internalising	n = 433	n = 341		n = 363
MDFT	20.14 (10.32)	14.81 (9.75)	N/A	13.08 (9.79)
IP	21.12 (11.18)	16.12 (10.90)	N/A	13.96 (9.16)
CBCL Externalising	n = 434	n = 341		n = 364
MDFT	26.25 (12.04)	18.44 (10.68)	N/A	16.34 (11.15)
IP	23.84 (11.51)	18.76 (12.39)	N/A	15.35 (9.80)
FES Conflict ^a	n = 429	n = 345	n = 308	n = 357
MDFT	0.43 (0.21)	0.59 (0.22)	0.65 (0.15)	0.59 (0.20)
IP	0.45 (0.21)	0.62 (0.20)	0.67 (0.13)	0.63 (0.21)
FES Cohesion	n = 429	n = 345	n = 308	n = 357
MDFT	0.63 (0.30)	0.83 (0.27)	0.80 (0.17)	0.85 (0.25)
IP	0.60 (0.29)	0.79 (0.27)	0.77 (0.18)	0.81 (0.26)

Note. Total sample was n = 450 adolescents. The table presents the number of cases (n) per outcome variable and assessment point on which the figures shown are based. YSR = Youth Self-Report, MDFT = Multidimensional Family Therapy, IP = Individual psychotherapy, N/A = Not applicable, CBCL = Child Behaviour Checklist (as completed by 1 parent), FES = Family Environment Scale.
^aHigher scores reflect less conflict.

ISSN: 1471-244X