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

Published in final edited form as: Dev Psychol. 2011 Sep 26;47(6):1504–1514. doi: 10.1037/a0025535

Table 2. Intercorrelations Among Outcome and Predictor Variables Across Times 1, 2, and 3 (n = 250).

Variable	1	2	3	4	5	6	7	8	9	10
1. Verbal Comprehension T1	—
2. Verbal Comprehension T2	.77^***	—
3. Verbal Comprehension T3	.72^***	.80^***	—
4. Decision Speed T1	.32^***	.27^***	.24^**	—
5. Decision Speed T2	.25^***	.23^**	.26^***	.63^***	—
6. Decision Speed T3	.12	.16^*	.26^***	.60^***	.73^***	—
7. Sleepiness intercept	–.18^**	–.19^**	–.20^**	–.09	–.16^*	–.06	—
8. Sleepiness slope	–.05	–.07	–.12	.03	.07	.00	–.63^***	—
9. Sleep/Wake Problems intercept	.03	.04	.04	–.09	–.15^*	–.12	.39^***	–.21^***	—
10. Sleep/Wake Problems slope	.05	–.01	–.01	.10	.10	.11	–.06	.29^***	–.41^***	—

Note. T1 = data collected at Time 1; T2 = data collected at Time 2; T3 = data collected at Time 3.

p < .05.

^**

p < .01.

^***

p < .001.