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

Published in final edited form as: J Atten Disord. 2017 Jun 15;22(9 Suppl):10S–20S. doi: 10.1177/1087054717713639

Table 1.

MTA Qualitative Study sample demographics

	ADHD (n = 125)	LNCG^* (n = 58)	Test statistic	p
Age	24.40 (1.18)	23.74 (0.95)	t(181) = 3.75	<.001
Sex
Male	95 (76%)	45 (77%)	χ²(1) = 0.06	.81
Female	30 (24%)	13(23%)
Race/ethnicity			χ²(5) = 5.00	.42
White	90 (72%)	49 (85%)
African-American	12 (10%)	2 (3%)
Asian	1 (1%)	1 (2%)
Mixed	15 (12%)	3 (5%)
Non-Black Hispanic	5 (4%)	2 (3%)
Other	2 (2%)	1 (2%)
Site (%)
Berkeley	36 (29%)	16 (28%)	χ²(3) = 0.18	.98
Duke	36 (29%)	16 (28%)
Irvine	35 (28%)	18 (31%)
Montreal^**	18 (14%)	8 (14%)

LNCG = Local Normative Comparison Group sample

^**

Note: Montreal’s N reflects their original sample, half the size of most MTA sites.