Table 2.

Scale Level Descriptive Statistics and Scale Inter-Correlations in the Present Data and Comparable Results From Stanford et al. (2009)

	First-Order
	Present Data (N = 691)			Stanford et al. (2009; N = 1,577)
Sub-Scale	Mean	SD	Alpha	Mean	SD	Alpha
ATT	9.2	2.4	.65	10.4	2.9	.72
CI	5.3	1.7	.54	6.4	1.9	.55
MOT	13.8	3.1	.61	15.0	3.2	.64
PER	7.6	1.9	.32	6.9	1.8	.27
CC	12.0	3.0	.65	11.5	2.6	.48
SC	11.2	2.5	.40	12.1	3.3	.72
	Second-Order
Sub-Scale	Present Data			Stanford et al.
ATT	14.4	3.5	.70	16.7	4.1	.74
MOT	21.5	4.0	.60	22.0	4.0	.59
NP	23.3	4.6	.67	23.6	4.9	.72
	aFirst-Order
Sub-Scale	ATT	CI	MOT	PER	CC	SC
ATT	-	.41	.34	.25	.36	.51
CI	.39	-	.27	.08	.02	.22
MOT	.28	.35	-	.19	.27	.41
PER	.23	.26	.24	-	.30	.31
CC	.47	.22	.37	.38	-	.39
SC	.30	.03	.21	.29	.41	-
	aSecond-Order
Sub-Scale	ATT	MOT	NP
ATT	-	.39	.45
MOT	.42	-	.50
NP	.40	.47	-

Note. Correlations below the diagonal are the present results; correlations above the diagonal are from Stanford et al. (2009). ATT = Attention; CI = Cognitive Instability; MOT = Motor; PER = Perseverance; CC = Cognitive Complexity; SC = Self-Control; NP = Non-Planning; SD = Standard Deviation.