|Figure 3-1: Percentage of children demonstrating proficiency in various cognitive skills, by poverty status and age: 2001-02, 2003-04, and 2005-06|
NOTE: Percentages reflect children who demonstrated mastery or "proficiency" by achieving a set threshold within a subscale measuring specific skills or abilities. The Early Childhood Longitudinal Study, Birth Cohort (ECLS-B) sampled children born in 2001. While ECLS-B assessed some infants as young as 6 months and as old as 22 months, estimates reflect information collected on infants around 9 months old (8 to 10 months). Estimates for 2-year-olds pertain to children assessed between 22 and 25 months old. Estimates for 4-year-olds pertain to children assessed between 48 and 57 months old. For more information on poverty, see supplemental note 1, and for more information on ECLS-B, see supplemental note 3.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Early Childhood Longitudinal Study, Birth Cohort (ECLS-B), Longitudinal 9-month–2-year Restricted-Use Data File and Longitudinal 9-month–Preschool Restricted-Use Data File.