Skip to main content
. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Intelligence. 2009;37(1):106–113. doi: 10.1016/j.intell.2008.09.003

Table 3.

Raw and estimated means and variance explained by the Level and Shape Growth Curve Factors.

Variable Raw Mean Estimated Mean r2
BSID II MDI 12 9.75 9.74 0.45
BSID II MDI 18 9.98 10.01 0.53
BSID II MDI 24 10.27 10.25 0.68
Verbal Composite 30 8.96 8.96 0.75
Verbal Composite 36 9.75 9.76 0.75
Verbal Composite 42 10.43 10.42 0.75
Verbal Composite 48 10.86 10.86 0.74
Nonverbal Composite 30 9.12 9.12 0.60
Nonverbal Composite 36 9.79 9.78 0.50
Nonverbal Composite 42 10.23 10.22 0.60
Nonverbal Composite 48 10.86 10.86 0.63

Note. Variables were standardized longitudinally to have a mean of 10 and a standard deviation of 1.