0.72, but correlations between DSM-IV NW and a definition of nicotine dependence using a cut-off of 4 or more on the Fagerström Test of Nicotine Dependence (FTND; Heatherton et al., 1991; Heatherton et al., 1989; Breslau and Johnson, 2000; Saccone et al., 2007b; Bierut et al., 2007) were a more modest r = 0.35 and r = 0.40 in the Australian and Finnish samples, respectively.
