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Table 4 Associations between tobacco use disorder (TUD) characteristics and STin2 VNTR genotypes and allelic variants

From: SLC6A4STin2 VNTR genetic polymorphism is associated with tobacco use disorder, but not with successful smoking cessation or smoking characteristics: a case control study

Smoking parameters Genotypes Allelic variants
  STin2 10/10 STin2 12/10 STin2 12/12 STin2.12 STin2.10
   n P* P* P* P* P*
Onset of TUD (years) 14.81 (±3.91) 185 0.868 0.170 0.156 0.868 0.146
Duration of TUD (years) 33.59 (±11.28) 185 0.061 0.262 0.478 0.061 0.837
Cigarettes/day 22.28 (±13.45) 185 0.120 0.987 0.377 0.120 0.274
Pack-years 37.02 (±28.11) 185 0.017 0.617 0.239 0.017 0.247
Fagerström score 5.71 (±2.21) 185 0.361 0.670 0.591 0.361 0826
Attempts at smoking cessation 1, 2 or 3 attempts 86/67/32 0.948 0.852 0.728 0.948 0.739
Successful smoking cessation Yes/no 64/185 0.658 0.858 0.612 0.658 0.630
  1. Results are shown as mean ± SD.
  2. *p values obtained in analyses of variance (all df = 1/183) or χ2 tests (all df = 1).