Table 6.

Proportion of participants (%) by mental age group able to complete tests yielding scores judged by examiners and by data review to be valid (combined studies 2 and 3)

Mental age group	Number	DCCS	Flanker	Picture vocabulary	Oral reading	Picture sequence memory	Picture comparison	List sorting
3	26	65.4	76.9	88.5	88.5	61.5	69.2	34.6
4	20	85.0	80.0	90.0	90.0	85.0	90.0	50.0
5–6	25	84.0	88.0	92.0	92.0	96.0	84.0	76.0
7–8	12	100.0	100.0	100.0	100.0	100.0	100.0	100.0
9+	5	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Note that in study 2, mental age was estimated based on chart review and examiner estimation. In study 3, mental age was measured by Stanford-Binet 5 IQ testing