Table 2.

Latent trajectory class analysis of parallel process model for inattention/hyperactivity and aggression

	Inattention/Hyperactivity			Aggression
Class	Trajectory	Intercept	Slope	Trajectory	Problem Intercept	Problem Slope	n	%
Comorbid	High	11.0*	−0.04	High	12.4*	−0.17	82	24
Aggressive	Low	1.2*	0.08	High	12.4*	−0.17	12	4
Inattentive/hyperactive	High	11.0*	−0.04	Low	6.97*	−0.39*	111	33
Healthy	Low	1.2*	0.08	Low	6.97*	−0.39*	130	39

Note: Inattention/hyperactivity growth parameters were fixed equal in the Comorbid and Inattentive/Hyperactive classes (high) and in the Aggressive and Healthy classes (low). Aggression problem growth parameters were fixed equal in the Comorbid and Aggressive classes (high) and in the Inattentive/Hyperactive and Healthy classes (low).

^*Significantly different from zero, p < .05.