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 Similarities 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.
|CHC:||Gc (Crystallised intelligence)|
|Administration method:||Trained interviewer; clinical setting; oral answers|
|Procedure:||The interviewer asked the child whether they knew how two different things or concepts were related, e.g. "In what way are hope and fear alike?".|
|Link to questionnaire:||http://www.bristol.ac.uk/alspac/researchers/our-data/clinical-measures/ (opens in new tab)|
|Scoring:||Items 1-5 were worth one point each, with the remaining items worth 0 - 2 points. 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):||f8ws021 - f8ws051|
|Descriptives:||Raw score||Scaled score|
|N = 7,404||N = 7,409|
|Range = 0 - 33||Range = 1 - 19|
|Mean = 13.86||Mean = 12.32|
|SD = 4.91||SD = 3.99|
|(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 Similarities (both verbal and picture similarities)|
|BCS70 – Age 10 – BAS Word Similarities|
|MCS – Age 11 – BAS II Verbal Similarities|
|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.|
|Northstone, K., Joinson, C., Emmett, P., Ness, A., & Paus, T. (2012). Are dietary patterns in childhood associated with IQ at 8 years of age? A population-based cohort study. Journal of Epidemiology and Community Health, 66(7), 624-628.|
For the named items in the table above, links are provided to their corresponding content on CLOSER Discovery. Where a variable range is provided, full variable lists can be accessed through the ‘Variable Groups’ tab on the linked Discovery page.
- Overview of all cognitive measures in ALSPAC
- 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’.