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. 2008 Jul 11;4(7):e1000125. doi: 10.1371/journal.pgen.1000125

Figure 3. Low Nicotine Dependence (%) as a Function of Haplotypes A and C versus Age of Onset of Daily Smoking Quartiles in the UT-WI-LHS Cohorts.

Figure 3

(A) Percentage of each haplotype in the FTND score<5 category as a function of age of onset quartiles. The percentage of individuals in the FTND<5 category for each quartile is shown by the dichotomous ‘FTND cut’ value. The age range for each quartile, with percentage of total subjects in parentheses, is as follows: <15 years (19%), 15–16 years (27%), 17–18 years (26%), and >18 years (29%).