|Table 2. Children's language, literacy, mathematics, color knowledge, and fine motor skills scores, by child's age (in months) at time of assessment and domain: 2005–06
|Domain||Less than 48 months (less than 4 years old)||48 through 57 months (4 years old to 4 years, 9 months)||More than 57 months (older than 4 years, 9 months)|
|Percent of population||16.4||74.6||9.0|
|Average receptive vocabulary score||7.8||8.6||9.0|
|Average expressive language score||2.1||2.4||2.6|
|Average overall literacy score||10.7||13.2||16.0|
|Average letter recognition score||22.9||32.7||43.5|
|Average phonological awareness score||3.0||3.3||3.7|
|Average conventions of print score||2.0||2.5||3.1|
|Average overall mathematics score||18.7||22.8||26.2|
|Percent of children demonstrating proficiency in numbers and shapes||44.8||65.4||79.0|
|Percent of children who scored 0 out of 10||2.2||1.3||#|
|Percent of children who scored 1 to 9||48.8||35.1||28.4|
|Percent of children who scored 10 out of 10||49.0||63.6||71.1|
|Fine motor skills|
|Average fine motor score||2.5||3.4||4.1|
|# Rounds to zero.
NOTE: Estimates weighted by W3R0. Detail may not sum to totals because of rounding. The receptive vocabulary score has a potential range of 0 to 15; the expressive language score has a potential range of 0 to 5; the overall literacy score has a potential range of 0 to 37; the letter recognition score has a potential range of 0 to 100; both the phonological awareness score and the conventions of print score have a potential range of 0 to 8; the overall mathematics score has a potential range of 0 to 44; the numbers and shapes score has a potential range of 0 to 100; the color knowledge score has a potential range of 0 to 10; and the fine motor skills score has a potential range of 0 to 7.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Early Childhood Longitudinal Study, Birth Cohort (ECLS-B), Longitudinal 9-Month-Preschool Restricted-Use Data File (NCES 2008-024).