| Sumario: | The Project on Human Development in Chicago Neighborhoods (PHDCN) was a large-scale, interdisciplinary study of how families, schools, and neighborhoods affect child and adolescent development. One component of the PHDCN was the Longitudinal Cohort Study, which was a series of coordinated longitudinal studies that followed over 6,000 randomly selected children, adolescents, and young adults, and their primary caregivers over time to examine the changing circumstances of their lives, as well as the personal characteristics, that might lead them toward or away from a variety of antisocial behaviors. Numerous measures were administered to respondents to gauge various aspects of human development, including individual differences, as well as family, peer, and school influences. One such measure was the Walk-A-Line instrument. It was administered to subjects in Cohort 0 and obtained a measurement of their motor skills. Subjects were timed walking on a line six inches wide by six feet long. In the first trial, the subjects were asked to walk the line at a regular pace. For the second and third trials, the subjects were asked to walk the line slowly.
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