The 1958 National Child Development Study (NCDS) assessed the children of a sub-sample of cohort members (CMs) using the Weschler Intelligence Scale for Children-Revised (WISC-R): Digit Span Subscale.
The child assessments included in the NCDS5 Child Interview (conducted when the CM was aged 33) applied only to the natural or adopted children of CMs aged 3 years, 11 months, and 16 days or older. Some 3,575 (71 percent) of the cohort children identified were eligible for the Child Interview. The tests were based on those used by the US National Longitudinal Survey of Youth (NLSY) for their 1990 survey of the children of female respondents. These tests were developed in the US and a number of changes (mainly substituting terminology) were made to individual assessments for use in the NCDS.
Prior to administering these tests, the interviewer calculated the Peabody Picture Vocabulary Test (PPVT) age of the child (actual age rounded up or down to the nearest whole month) to establish, if the child was eligible for testing, which tests would be administered and, for some tests, the appropriate starting point of the test. Time at start and completion (24 hour clock) was calculated using the following variables: n520128 n520130 n521935 n521937.
The WISC-R Digit Span Subscale is intended for administration with children aged 7 years or older. Details on this measure as applied to the NCDS sub-sample and the data collected are outlined in the table below.
[table id=182 /]
- Overview of all cognitive measures in NCDS
- Overview of childhood cognitive measures across all studies
This page is part of CLOSER’s ‘A guide to the cognitive measures in five British birth cohort studies’.