Data on ODD symptom ratings from at least one informant (mother or teacher) were provided on 969 children who participated in Phase III of the NICHD Study of Early Child Care and Youth Development (SECCYD), a study that ran from birth through sixth grade. The SECCYD sample comprises a diverse group of children born in 1991 in 10 locations across the United States. The taxometric analyses were conducted using data collected when the children were in sixth grade. Details about how the participants were sampled, data collection procedures, and the demographics of the group can be found in the NICHD Early Child Care Research Network (2005).
