MCS - Age 11 - British Ability Scales II (BAS II) Verbal Similarities

The Millennium Cohort Study (MCS) assessed their cohort members (CMs) during the study’s age 11 sweep using the Verbal Similarities measure from the British Ability Scales II (BAS II).

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

Year of data collection:	2012
Domain:	Verbal (reasoning using verbal concepts)
Measures:	(Acquired) verbal knowledge and verbal reasoning: Verbal reasoning ability Expressive language skills, including verbal fluency Vocabulary knowledge General knowledge Abstract and logical thinking Ability to distinguish between essential and superficial features Level of language stimulation
CHC:	Gc (Crystallised ability)
CLOSER source:	Explore this sweep in CLOSER Discovery: MCS Age 11 Survey (2012).
Administrative method:	Home interviewer using Computer-Assisted Personal Interview (CAPI), face to face; read to child, verbal response
Procedure:	Verbal Similarities was modified to be administered with the help of the CAPI programme. The general rule in BAS assessments is that the older the child the further into the assessment they start. As all of the cohort children were approximately the same age, they all started the assessment in the same place, at item 16, after completing Example A. The child was given three stimulus words and asked to name the class to which all the examples belong.
Link to questionnaire:	No direct link to pdf
Scoring:	All items (except Example A) were scored 1 or 0 points.
	The assessment started at item 16 (age relevant start point). The test terminated at item 28, unless: There were less than 3 incorrect responses. In this case, the test continued from item 29 to 33 There were less than 3 correct answers . In this case, the test went back to item 8 to item 15. There were 5 consecutive incorrect answers and less than 3 correct answers. In this case, the assessment would stop and go back to items 8 to 15. If items 8 to 16 were difficult, the test wasrouted back to item 1
Item-level variable(s):	ECQ01I00 – ECQ37I00
	LOW HIGH (base, ceiling)
Total score/derived variable(s):	EVSRAW (raw score – total number of correct responses)
	EVSABIL (ability adjusted – total number of correct responses, accounting for the sets of items the CM was presented with, which depended on age and successful completion of blocks of items)
	EVSTSCO (ability and age adjusted)
Age of participant (months):	Mean = 134.02, SD = 3.97, Range = 122 – 148
Descriptives:		EVSRAW	EVSABIL	EVSTSCO
		(raw score)	(ability adjusted)	(ability and age adjusted)
	N	13,168	13,168	13,168
	Range	0 – 22	10 – 179	20 – 80
	Mean	8.66	120.6	58.69
	SD	3.64	17.11	10.07
		(click image to enlarge)	(click image to enlarge)	(click image to enlarge)
Other sweep and/or cohort:	BCS70 – Age 10 – BAS Word Similarities (v1)
	ALSPAC – Age 8.5 – WISC-III Similarities – verbal similarities asked slightly differently
	ALSPAC – Age 4 – WPPSI-RUK Similarities – both verbal and picture similarities
Source:	Elliott, C. D., Smith, P., & McCulloch, K. (1996). British Ability Scales Second Edition (BAS II). Administration and Scoring Manual. London: Nelson.
Technical resources:	Elliott, C. D., Smith, P. & McCulloch, K. (1997). British Ability Scales Second Edition (BAS II). Technical Manual. London: Nelson.
	Gallop, K., Rose, R., Wallace, E., Williams, R., Cleary, A., Thompson, A., Burston, K., Frere-Smith, T., Dangerfield, P., & Tietz , S. Millennium Cohort Study Fifth Sweep (MCS5): Technical Report. London: Ipsos MORI. (pp. 38-41).
	Connelly, R. (2013). Interpreting Test Scores. Millennium Cohort Study Data Note 2013/01. London: Centre for Longitudinal Studies.
Reference examples:	Brown, M., & Sullivan, A. (2014). Cognitive Development. In Platt, L (ed), Millennium Cohort Study: Initial findings from the Age 11 survey. London: Centre for Longitudinal Studies.
	Barbuscia, A., & Mills, M. C. (2017). Cognitive development in children up to age 11 years born after ART – a longitudinal cohort study. Human Reproduction, 32(7), 1482-1488.