ALSPAC – Age 8.5 – WISC-III Comprehension

Scoop.it ShareThis

The Avon Longitudinal Study of Parents and Children (ALSPAC) assessed their cohort members (CMs) during the study’s age 8.5 sweep (Focus@8) using the Comprehension measure from the Wechsler Intelligence Scale for Children (WISC-III).

Details on this measure and the data collected from the CMs are outlined in the table below.


Domain:Verbal comprehension
Measures:Verbal comprehension
Verbal reasoning
Verbal expression
CHC:Gc (Crystallised intelligence)
Administration method:Trained interviewer; clinical setting; child answers orally
Procedure:The child was asked a series of questions based on his or her understanding of general concepts, e.g. "Why do people brush their teeth?", "Why can birds fly, but cats can't?". Interviewers were allowed to repeat questions if the child did not understand. Responses were scored on a 0 - 2 metric. If the child spontaneously improved their answer, this was accepted.
Link to questionnaire:http://www.bristol.ac.uk/alspac/researchers/our-data/clinical-measures/ (opens in new tab)
Scoring:Responses were scored on a 0 - 2 metric. Raw scores were converted into scale scores using tables provided in the WISC manual (M = 10, SD = 3).
Item-level variable(s):Not readily available
Total score/derived variable(s):f8ws024 - f8ws054
Descriptives:Raw scoreScaled score
N = 7,328N = 7,334
Range = 0 - 34Range = 1 - 19
Mean = 17.13Mean = 10.98
SD = 4.77SD = 3.71
(click image to enlarge)
(click image to enlarge)
Age of participants:Mean = 103.82 months, SD = 3.92, Range = 89 - 127
Other sweep and/or cohort:ALSPAC – Age 4 – WPPSI-RUK Comprehension
Source:Wechsler, D. (1991). WISC-III: Wechsler intelligence scale for children: Manual. Psychological Corporation.
Technical resources:Kaufman, A. S., & Lichtenberger, E. O. (2000). Essentials of WISC-III and WPPSI-R assessment. John Wiley & Sons Inc.
Reference examples:Horwood, J., Salvi, G., Thomas, K., Duffy, L., Gunnell, D., Hollis, C., ... & Zammit, S. (2008). IQ and non-clinical psychotic symptoms in 12-year-olds: results from the ALSPAC birth cohort. The British Journal of Psychiatry, 193(3), 185-191.
Bornstein, M. H., Hahn, C. S., & Wolke, D. (2013). Systems and cascades in cognitive development and academic achievement. Child Development, 84(1), 154-162.

Go to:


This page is part of CLOSER’s ‘A guide to the cognitive measures in five British birth cohort studies’.