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. Author manuscript; available in PMC: 2013 Aug 13.
Published in final edited form as: Am J Med Genet B Neuropsychiatr Genet. 2011 Mar 28;0(4):421–429. doi: 10.1002/ajmg.b.31177

Table 1.

Basic demographic information of the three smoking phenotypes by study population

African-American European-American
Number of genotyped subjects 1790 1249
  Males (%) 1003 (56.0) 721 (57.7)
  Age (years±SD) 41.2±9.7 38.6±11.9
  Household gross income (dollars/year±SD) 16889±20768 30541±34971

Cigarettes smoked per day (CSPD) 1385 915
  CSPD (Means±SD) 13.5±9.1 18.8±9.6
  Males (%) 834 (60.2) 549 (60.0)
  Age (years±SD) 42.2±8.8 38.4±11.3

DSM-IV diagnosis of ND
Cases 990 716
  Males (%) 585 (59.0) 434 (60.6)
  Age (years±SD) 41.9±8.5 38.1±10.9
Controls 237 223
  Males (%) 59 (24.9) 92 (41.3)
  Age (years±SD) 36.6±12.8 38.8±14.7

Dichotomized FTND
 FTND (Means±SD) 3.3±2.7 3.7±3.1
Cases 897 705
  Males (%) 540 (60.2) 434 (61.6)
  Age (years±SD) 42.1±8.6 38.8±10.8
Controls 229 214
  Males (%) 53 (23.6) 86 (41.3)
  Age (years±SD) 36.2±12.9 38.5±14.9
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