Skip to main content
. Author manuscript; available in PMC: 2019 Feb 27.
Published in final edited form as: J Cogn Dev. 2018 Feb 27;19(2):182–200. doi: 10.1080/15248372.2018.1439493

Table 2.

Average scores on cognitive measures at 2 and 6 years.

Measure Score Mean
(SD)
2-Year Measures
Mullen Scales of Early Learning
 Early Learning Composite 109.27 (15.33)
 Nonverbal Developmental Quotient 101.83 (12.88)
 Verbal Developmental Quotient 106.78 (15.32)
6-Year Measures
Stanford-Binet Intelligence Scales
 Working Memory (N = 109) 112.07 (13.31)
 Abbreviated IQ (N = 223) 106.22 (13.35)
CANTAB
 Spatial Span (N = 224)     3.73 (0.91)
 Stockings of Cambridge (N = 230)     5.31 (1.87)
BRIEF
 Global Executive Composite (N = 224)   50.92 (9.79)

Note. Ns represent the number of participants included in generalized estimating equations models predicting each outcome measure from the 2-year predictors. Sample sizes vary because of missing covariates, because of invalid data, or because a particular assessment was not completed. CANTAB = Cambridge Neuropsychological Test Automated Battery; BRIEF = Behavior Rating Inventory of Executive Function.