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. Author manuscript; available in PMC: 2018 Mar 25.

Published in final edited form as: Am J Intellect Dev Disabil. 2014 May;119(3):220–234. doi: 10.1352/1944-7558-119.3.220

Table 3.

Linear Trajectory Statistics for Each Category Learning Measure Over Nonverbal Ability in Each Group

Group	Regression results	Regression equation
MCST
Down syndrome	R² = .449, F(1, 39) = 31.72, p < .001	y = 0.48x + 5.08
Intellectual disability	R² = .079, F(1, 23) = 1.98, p = .173	y = 0.46x + 7.54
Typically developing	R² = .589, F(1, 26) = 37.27, p < .001	y = 0.71x + 8.85
Concept Formation test
Down syndrome	R² = .242, F(1, 39) = 12.47, p = .001	y = 0.21x + 2.15
Intellectual disability	R² = .331, F(1, 23) = 11.39, p = .003	y = 0.44x + 0.76
Typically developing	R² = .529, F(1, 26) = 29.16, p < .001	y = 0.52x + 1.14

Note. MCST = Modified Card Sort Task.