Table 2 Effect of genotype on mean smoking duration
From: CHRNA5 and CHRNA3 polymorphism and lung cancer susceptibility in Palestinian population
|  | Duration (years) mean ± SD | P value |
|---|---|---|
CHRNA5 (c.1192G > A) rs16969968 | ||
 GG | 35.4 ± 12.4 | 0.402 |
 GA | 30.6 ± 13.6 | |
 AA | 31.8 ± 10.7 | |
CHRNA3 (c.65C > T) rs1051730 | ||
 CC | 35.8 ± 13.1 | 0.320 |
 CT | 30.6 ± 12.9 | |
 TT | 35.8 ± 10.3 | |