Frequently Asked Questions

Sample Selection

Were children with disabilities sampled in ECLS-B?

Children with disabilities and special health needs were included in the ECLS-B sample. NCES and the Office of Special Education Programs (OSEP) conducted an evaluation of the feasibility of oversampling young children with disabilities and special health needs and determined that such an oversampling could not be pursued. However, the ECLS-B oversampled twins and infants born with low and very low birth weight. Low birth weight and short gestation (common among twins) are strongly associated with early developmental difficulties and special health needs. Additionally, information is gathered on early health and developmental disabilities and on the services children receive. The ECLS-B aimed to be as inclusive as possible, and assessments were designed to include children of all levels of ability and skill. Exclusion from the assessments was considered on a case-by-case basis; in most cases where an exclusion occurred, a child was excluded only from certain components of the assessment rather than from the entire assessment. For the 9-month and 2-year data collections, all children were included in the untimed one-on-one assessments. Accommodations were made (and documented) when necessary. For the preschool and kindergarten data collections, most children were included in the untimed one-on-one assessments. However, children who required Braille or sign language were not administered the cognitive assessments, though they did participate in the motor and physical assessments with accommodations. Children who were in a wheelchair did not participate in the gross motor assessments and accommodations were made in order to obtain their physical measurements. The special needs of all other children who had them were accommodated (e.g., children who normally used some type of assistive device were allowed to use the device during the assessment).