The association between biochemical parameters and conduct disorder (C
D) was studied in 22 boys admitted to a residential center. Three-meth
oxy-4-hydroxyphenylglycol (MHPG) levels were significantly higher in p
repubertal CD youth than in pubertal/post pubertal CD youth. Homovanil
lic acid (HVA) levels were significantly lower in CD youth under age 1
2.0 years than in non CD youth under age 12.0 years. The implications
of these biodevelopmental findings in the study of CD are di