. 2010 Feb 10;35(6):1325–1332. doi: 10.1038/npp.2010.1

Table 3. Severity of AD in the European-American and African-American Subjects.

Affection	Number of positive DSM-IV AD items	EA	AA	z-score	p-value
	n	746	837
Not AD	0–2	51.1%	51.7%	0.26	0.793
Moderate AD	3–5	24.4%	30.5%	2.7	0.007
Severe AD	6–7	24.5%	17.8%	3.28	0.001

Abbreviations: AD, alcohol dependence; DSM-IV, Diagnostic and Statistical Manual of Mental Disorders, 4th Edition.