ALSPAC – Age 8.5 – WISC-III Coding

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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 Coding 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:Non-verbal sequencing
Measures:Visual-motor coordination/speed
Short-term visual memory
Cognitive flexibility
Visual sequencing
Concentration
CHC:Gv (Visual Processing)
Gs (Processing Speed)
Administration method:Trained interviewer; clinical setting; pen and paper
Procedure:The child was shown a key which contained geometric shapes, each of which was marked by a symbol. Next they were presented with rows and columns containing only the geometric shapes, and were tasked with marking each one with the appropriate symbol. Sample items were administered first.
Duration: The actual trial lasted for 120 seconds.
Link to questionnaire:http://www.bristol.ac.uk/alspac/researchers/our-data/clinical-measures/ (opens in new tab)
Scoring:One point was awarded for each correctly drawn symbol, and these were converted to standardised scores (M = 10, SD = 3) using the WISC manual.
Item-level variable(s):Not readily available
Total score/derived variable(s):f8ws027 - f8ws057
Descriptives:Raw scoreScaled score
N = 7,404N = 7,403
Range = 0 - 99Range = 1 - 19
Mean = 34.52Mean = 10.49
SD = 7.45SD = 3.04
(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:None
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.

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