Table 2.

Sample Performance on Cognitive and Behavioral Variables

	Age 3a (n = 18)		Age 4b (n = 29)		Age 5c (n =12)		Group Comparisons (Tukey HSD)
	Mean	SD	Mean	SD	Mean	SD
PPVT-IV	65.5	17.7	78.8	19.2	103.0	16.6	a < b*,c**; b < c**
KABC-II Number Recall	7.4	1.9	8.1	2.5	10.2	2.8	a < c**; b < c*
NEPSY-II Statue	21.0	6.8	19.3	5.9	25.2	5.5	b < c**
ACPT-P
Omissions	2.7	3.3	1.3	2.8	0.5	1.2	a < c*
Commissions	0.7	1.1	0.6	0.9	0.2	0.4	All n.s
Mean Response Time	1778.9	883.2	1053.7	756.2	877.7	391.5	a < c**; b < c**
Variability	0.3	0.6	0.5	0.3	0.5	0.4	All n.s
BASC-II
Attention	49.9	6.7	48.9	6.2	48.4	9.8	All n.s
Hyperactivity	48.0	9.7	47.5	7.3	46.8	9.5	All n.s.

Note: PPVT-IV = Peabody Picture Vocabulary Test-IV; KABC-II = Kaufman Assessment Battery for Children-II; BASC-II = Behavior Assessment System for Children-II. PPVT-IV, Number Recall, Statue, and ACPT-P variables all listed as raw scores. Mean response time and variability are reported in milliseconds. BASC-II scores are T-scores;

^*p < .05,

^**p < .01.