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

Published in final edited form as: Neuropsychology. 2016 Jan 11;30(4):449–473. doi: 10.1037/neu0000259

Table 1.

NCANDA demographics for neuropsychological test analysis (N=831)

		No/Low Drinker (N=692)		Male vs. Female		Exceeded-Threshold (N=139)		Male vs. Female		No/low vs. Exceeds

		Male	Female	t or χ²	p	Male	Female	t or χ²	p	t or χ²	p
	N	344	348			64	75
Age (years)	mean	15.6	15.8	−0.850	0.3954	18.4	18.5	−0.305	0.7609	−14.841	0.0000
	standard deviation	2.3	2.4			2.0	2.0
	N	344	348			64	75
Education (years)	mean	8.9	9.2	−1.155	0.2486	11.7	11.9	−0.440	0.6607	−14.524	0.0000
	standard deviation	2.3	2.5			1.9	2.0
	N	342	346			64	74
Pubertal Development Scale	mean	2.9	3.4	−10.917	0.0000	3.5	3.8	−5.635	0.0000	−11.553	0.0000
	median	3.0	3.6			3.6	4.0
	standard deviation	0.7	0.6			0.5	0.2
	N	339	345			62	73
Socioeconomic status	mean	17.0	16.6	2.057	0.0401	17.1	17.3	−0.400	0.6902	−1.743	0.0832
	standard deviation	2.4	2.5			2.1	2.3
	N	326	326			54	58
Handedness	L/R/A	33/261/49	23/290/35	5.936	0.0514	2/53/9	7/61/7	2.736	0.2546	0.527	0.7685
	N	343	348			64	75
Family History of Alcoholism
	negative/positive	318/26	316/32	0.410	0.5222	50/14	63/12	0.445	0.5047	12.464	0.0004
Self-declared Ethnicity	N	344	348	8.997	0.1092	64	75	3.279	0.3505	5.215	0.3902
Caucasian		251	235			52	57
African-American		34	53			3	9
Asian		27	25			6	4
Pacific Islander		1	3			0	0
American Indian		3	0			0	0
Mixed		28	32			3	5

N=number

L/R/A=left/right/ambidextrous