. Author manuscript; available in PMC: 2012 Mar 1.

Published in final edited form as: J Exp Child Psychol. 2011 Mar;108(3):453–468. doi: 10.1016/j.jecp.2010.08.009

Table 1.

Participant Demographics

	Age Group
	Early Childhood	Late Childhood	Adolescence	Young Adulthood	Group Difference
N	38	38	39	38
Gender (F:M)	21:17	17:21	19:20	19:19	NS
% Caucasian	79	84	77	66	NS
Mean (SD) Years of Age	7.8 (.8)	11.1 (1.1)	15.0 (1.4)	21.1 (1.7)	EC < LC < A < YA^**
Mean (SD) Years of Education	1.8 (1.0)	5.1 (1.1)	9.0 (1.5)	13.7 (1.3)	EC < LC < A < YA^**
Mean (SD) Vocabulary T Score	60.9 (13.2)	60.1 (8.2)	56.6 (8.4)	60.8 (7.1)	NS
Mean (SD) Matrix Reasoning T Score	58.4 (9.7)	56.7 (8.7)	52.5 (7.2)	57.5 (6.4)	A < EC, LC, YA^*
Mean (SD) IQ	118.6 (15.4)	115.1 (13.2)	108.1 (11.7)	116.2 (8.4)	A < EC, LC, YA^**

NS denotes an effect in which p > .05.

^**

p < .001.

p < .05