F. Vitaro et Re. Tremblay, IMPACT OF A PREVENTION PROGRAM ON AGGRESSIVE CHILDRENS FRIENDSHIPS AND SOCIAL-ADJUSTMENT, Journal of abnormal child psychology, 22(4), 1994, pp. 457-475
A group of 46 aggressive boys aged 8 to 9 years participated in a prev
ention program aimed at reducing their externalizing problems in the s
hort term and at preventing delinquency in the long term. Outcome meas
ures were collected during the 3-year period following the prevention
program. At that time, the boys were 10, 11, and 12 years old. Outcome
measures included teacher ratings of aggressiveness and self-reports
of delinquent behaviors. The boys' friends were rated on disruptive be
haviors by their classmates. The experimental boys' outcome measures w
ere compared to the measures obtained from 58 aggressive boys in a con
trol group. The disruptive ratings of the experimental and control sub
jects' best friends were also compared. Differences in teacher-rated a
ggressiveness between the two groups increased from one year to the ne
xt for the 3-year followup period. Similarly, the friends' disruptive
scores differed increasingly between the two groups over the 3-year pe
riod The effect of the prevention program on the subjects' friendships
and the mediating impact of friends with regard to social adjustment
were stressed