Engagement status was examined using increasingly strict criteria so that families randomly assigned to the intervention condition who engaged in the FCU at any point from child ages 2 through 4 were initially coded as 1 (n = 317, 86.4%), and those who did not choose to participate at all were coded as 0 (n = 50, 13.6%). Engagement was subsequently defined as participation in at least two feedbacks and all three feedbacks, with n = 249 (67.8%) and n = 163 (44.4%) participants coded as 1, respectively. Given the health maintenance hypothesis, it was expected that periodic, yearly FCUs would reduce parent reports of child disruptive behaviors over time. It is noteworthy that nearly three quarters of the intervention group participated in the FCU at child age 2, and engagement in the FCU decreased somewhat during the next 2 years. The effect of the intervention assignment for engagers/nonengagers (defined as completing one, two, or three FCU feedback opportunities or not) was estimated on the basis of CACE modeling, described in more detail later in this article.
