. Author manuscript; available in PMC: 2019 Apr 1.

Published in final edited form as: Sleep Health. 2018 Feb 21;4(2):174–181. doi: 10.1016/j.sleh.2018.01.001

Table 4.

Intercorrelations and Descriptive Statistics of Study Variables

Variable	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
1. Sex	--
2. Race	.02	--
3. Age	−.09^*	−.09^*	--
4. ADHD-IN	−.01	−.02	.03^*	--
5. ADHD-HI	.01	.04^*	−.01	.57^*	--
6. Anxiety	.07^*	−.03^*	.01	.52^*	.46^*	--
7. Depression	.01	−.04^*	.03^*	.53^*	.32^*	.64^*	--
8. Sleep quality	.02	−.03^*	.02	.27^*	.19^*	.28^*	.31^*	--
9. Sleep latency	.03^*	−.001	.03^*	.19^*	.15^*	.22^*	.22^*	.44^*	--
10. Sleep duration	.01	−.11^*	.04^*	.17^*	.13^*	.19^*	.21^*	.44^*	.22^*	--
11. Sleep efficiency	.10^*	−.02^*	.02	.12^*	.08^*	.14^*	.14^*	.26^*	.24^*	.42^*	--
12. Sleep disturbances	.06^*	.003	.02	.28^*	.26^*	.38^*	.31^*	.34^*	.34^*	.15^*	.18^*	--
13. Sleep medication	.06^*	.08^*	.01	.14^*	.13^*	.18^*	.15^*	.19^*	.23^*	.04^*	.12^*	.23^*	--
14. Daytime dysfunction	.09^*	.01	.02	.46^*	.27^*	.39^*	.49^*	.36^*	.21^*	.25^*	.12^*	.30^*	.16^*	--
15. Total sleep	.09^*	minus;.02	.04^*	.37^*	.28^*	.41^*	.42^*	.71^*	.67^*	.62^*	.58^*	.55^*	.47^*	.56^*	--
16. Sleep status	.07^*	minus;.02^*	.01	.28^*	.21^*	.29^*	.30^*	.53^*	.56^*	.50^*	.40^*	.41^*	.31^*	.43^*	.76^*	--

Mean	--	--	19.14	0.66	0.63	0.49	0.54	1.18	1.39	0.97	0.59	1.27	0.41	1.06	6.87	--
SD	--	--	1.42	0.55	0.50	0.52	0.62	0.67	0.98	0.87	0.86	0.55	0.82	0.77	3.29	--

Note. N = 7,626. For sex, 0 = male, 1 = female. For race, 0 = non-White, 1 = White. For sleep status, 0 = good sleep, 1 = poor sleep. For all sleep variables, higher scores indicate worse sleep. ADHD-HI = attention-deficit/hyperactivity disorder hyperactivity-impulsivity symptoms. ADHD-IN = attention-deficit/hyperactivity disorder inattention symptoms.

p < .05.

p < .01 (bold).

p< .001 (bold and underline).