Child participants were assessed at 15 data collection points starting prenatally through 12 years old. When parents were initially contacted they ranged in age from 18 to 35 years. A broad selection of measures was used in data collection including interviews, questionnaires, structured and semi-structured psychological tests, and naturalistic home observations. The Murray Center holds computer-accessible data for the first six years of the project. The center expects to receive additional waves of data in the future.
All participants are White.
Child participants were assessed at 15 time points starting prenatally and continuing to the age of 12. At the beginning of the study, mothers had a mean age of 25.4 years, with a range of 18 to 33 years. The fathers' average was 27.9 years, with a range of 19 to 49 years. The greatest concentration of participants were born in the Pacific states. Eighty-three percent of the families lived in urban settings, with the remainder in semirural settings.