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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