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The Early Childhood Longitudinal Study, Kindergarten Class of 1998-1999 (ECLS-K) focuses on children's early school experiences beginning with kindergarten through fifth grade. It is a nationally representative sample that collects information from children, their families, their teachers, and their schools. ECLS-K provides data about the effects of a wide range of family, school, community, and individual variables on children's cognitive, social, emotional, and physical development, their early learning and early performance in school, as well as their home environment, home educational practices, school environment, classroom environment, classroom curriculum, and teacher qualifications.

With a few exceptions, the fifth grade data file contains all data collected from parents, children, teachers, or schools in the base year (fall and spring), first grade (fall and spring), third grade (spring), and fifth grade (spring) data collections. To streamline the file, however, the data from the household rosters that listed all household members, their relationship to the sampled child, and selected other characteristics are not included in the file. The composite variables describing critical household roster-based information, such as the children's family structure and selected characteristics of the family members, have been retained on the file.

Specific subjects covered by the variables in this data file include parent/child gender, parent/child race, family background, socioeconomic status, household income, parents' education level, and parents' employment and marital status. Other variables include type of childcare and childcare arrangements, the child's math, science, and reading scores, the child's learning problems and autism, as well as the child's diet issues, food security, and school food service. Variables about teachers include age, race, background, qualifications, job satisfaction, their level of impact on curriculum and policy, and time spent on classroom activities and specific subjects. Other variables include diversity of classroom students, parent-teacher discussions, family participation in school events and fundraising, whether the child's school has bars on the windows and doors, fire alarms, sprinklers, and fire extinguishers, the presence of school graffiti, as well as bus/transportation issues.