Table 1.

Demographic and smoking characteristics across genotype.

Measure	Val/Val (n=17)	Met/Met (n=19)	p-value
Sex, % female	44	50	0.73
Age	37.4 (15)	35.5 (12)	0.88
Nicotine dependence	4.1 (2.4)	4.5 (1.6)	0.50
Baseline cigarettes per day	15.6 (4.5)	16.7 (6.1)	0.55
Cigarettes smoked prior to smoking session	15.3 (3.6)	16.7 (6.2)	0.58
Shipley Institute of Living Scale	111.6 (4.3)	106.5 (8.0)	0.02
CO during smoking session (ppm)	19.8 (9.8)	25.8 (10.5)	0.09
CO during abstinent session (ppm)	2.7 (1.6)	2.4 (1.3)	0.50

Note. Values are mean (standard deviation). p-values are unadjusted for multiple comparison; ppm=parts per million