In summary, when moving from an ITT analysis to the CACE strategy that incorporates successive years of engagement, the effect size of intervention on growth in children’s problem behavior from age 2 to age 5 increased from small to large (e.g., ITT d = .30, 1 FCU d = .44, 2 FCUs d = .55, 3 FCUs d = .93), and from small to moderate on teacher-rated problem behavior at age 7.5 (e.g., ITT d = .17, 1 FCU d = .23, 2 FCUsd = .29, 3 FCUs d = .47). These results suggest intervention dosage may be an important factor for preventing problem behaviors for high-risk populations.
