Across all three cohorts, 596 children from 338 families provided four waves of data (ages 2–17), separated by three-year intervals for mother- and father-reports of children’s externalizing symptoms. A total of 399, 339, 402, and 418 participants had reports on their functioning available at waves 1–4, respectively, yielding an overall participation rate of 73% for those with at least two waves of data in the sample (see Zucker et al., 2000).
