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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Mol Psychiatry. 2015 Aug 4;21(5):601–607. doi: 10.1038/mp.2015.105

Table 1.

Characteristics of primary sample

European American
(n=1432)		 African American
(n=1388)
cases controls cases controls
Sample, n 728 704 854 534
Age, mean (range) 37 (25-45) 36 (25-45) 36 (25-45) 36 (25-45)
Sex
  Female 386 (53%) 482 (68%) 514 (60%) 321 (60%)
  Male 342 (47%) 222 (32%) 340 (40%) 213 (40%)
FTND1 score, mean (range) 6.49 (4-10) 0.02 (0-1) 6.21 (4-10) 0.33 (0-1)
CPD2 category, mean (range) 1.94 (0-3) 0.01 (0-1) 1.11 (0-3) 0.03 (0-1)
1

FTND is the Fagerström Test for Nicotine Dependence

2

CPD is categorical cigarettes per day (1 is ≤10, 2 is 11-20, 3 is 21-30, 4 is >30);