. Author manuscript; available in PMC: 2017 Feb 1.

Published in final edited form as: J Abnorm Psychol. 2016 Feb;125(2):233–247. doi: 10.1037/abn0000100

Table 1.

Means, Standard Deviations, and Correlations Between Study Variables

	MTA Probands		LNCG		Lower triangle = MTA probands; Upper triangle = LNCG

	M	SD	M	SD	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
1. Impairment^a	−.01	.94	−1.20	.89	1	−.14^*	−.08^*	−.06^*	−.05^*	-	−.05^*	−.04	−.07^*	.05^*	−.11^*	−.02	−.03	.03	.19^*	.24^*	.28^*
2. Parent involve (adol)	3.58	.46	3.78	.47	−.12^*	1	.20^*	.00	.10^*	-	.09^*	−.03	.06^*	.08^*	.03	−.05^*	.02	.03	−.02	.00	−.08^*
3. Parent support (adult)	2.95	.84	2.94	.83	−.06^*	.15^*	1	.01	−.02	-	.21^*	.07^*	.10^*	.05^*	.03	−.01	−.03	.01	−.06^*	−.03	−.08^*
4. Age^a	17.10	5.00	16.91	4.91	.15^*	.01	−.00	1	.02	-	−.00	.01	−.02	−.04^*	−.07^*	−.01	.27^*	−.04	.01	−.06^*	.02
5. Family income	4.93	2.49	5.86	2.61	.03	.06^*	−.05^*	.04	1	-	−.06^*	−.31^*	−.24^*	.13^*	.37^*	−.24^*	.06	−.07	−.04	−.08^*	−.03
6. Special education	279.23	398.72	-	-	.13^*	.06^*	.03	−.01	−.05^*	1	-	-	-	-	-	-	-	-	-	-	-
7. Female (%)	19.89	-	19.77	-	−.03	.07^*	.11^*	.03	.08^*	−.06^*	1	−.01	.03	.04	.12^*	−.02	.00	.00	−.07^*	−.00	−.05
8. Black (%)	19.71	-	11.24	-	.05^*	.02	.12^*	−.03	−.22^*	−.01	−.01	1	−.13^*	−.12^*	−.10^*	.16^*	−.05	.04	.01	.00	−.00
9. Hispanic (%)	6.93	-	13.18	-	−.01	−.13^*	.02	−.00	−.16^*	.01	−.05^*	−.13^*	1	−.13^*	−.17^*	.10^*	−.12^*	−.00	−.04	.03	−.03
10. Other (%)	12.04	-	11.24	-	.03	.00	.06^*	−.03	−.08^*	−.01	−.04^*	−.17^*	−.09^*	1	.04	−.06^*	.02	.01	.04	.02	.06^*
11. Attended college (%)	42.15	-	67.87	-	−.07^*	.15^*	−.02	.07^*	.27^*	−.17^*	.11^*	−.07^*	−.07^*	.02	1	−.27^*	.18^*	−.14^*	−.01	−.03	−.02
12. Dropped out (%)	10.22	-	2.71	-	.09^*	−.14^*	−.00	.02	−.17^*	.01	−.04^*	−.04^*	.05^*	.00	−.32^*	1	−.06	.06	.00	−.02	.03
13. Living indep^a (%)	35.78	-	43.81	-	−.09^*	−.01	−.06	.20^*	.09^*	−.12^*	.05	−.04	−.05	−.03	.05	−.08^*	1	−.11^*	.08	.09^*	−.08
14. Other living^a (%)	2.64	-	1.55	-	.04	−.01	.01	.01	.05	−.01	−.02	−.01	−.02	−.01	−.05	.05	−.12^*	1	−.01	−.03	−.02
15. ADHD dx^a (%)	37.80	-	2.00	-	.30^*	−.05^*	−.04	−.23^*	−.01	.05^*	−.02	.06^*	.00	−.01	−.06^*	.02	−.08^*	−.01	1	.13^*	.16^*
16. Internalizing dx^a (%)	18.85	-	7.83	-	.11^*	.02	.01	−.26^*	−.05^*	.01	.07^*	.04^*	.01	.02	−.04^*	.01	.02	.04	.19^*	1	.16^*
17. Externalizing dx^a (%)	31.37	-	4.58	-	.31^*	−.12^*	−.02	−.25^*	−.04^*	.06^*	−.05^*	.04	.03	.01	−.08^*	.08^*	−.10^*	−.02	.30^*	.26^*	1

Note. Impairment factor scores are on a conditionally standardized scale, with values ranging from −2.27 to 2.33. On average, impairment scores for MTA probands were 1.2 standard deviations higher than for LNCG. Parent involvement ranged from 1 to 5. A score of 3=sometimes and 4=often. Parent support ranged from 1 to 5. A score of 3=very much and 4=extremely much. Family income at baseline was reported on a 9-point scale. Each point represented an interval of $10,000 in annual income. A score of 4=$30,000 to $40,000 per year; a score of 5=$40,000 to $50,000 per year.

Impairment, age, living arrangements, and diagnoses (ADHD, internalizing, externalizing) varied from wave to wave. Summary statistics in this table pool over all waves of assessment.

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