Table II.
Cigarettes per daya | SCCS, n = 483 | MDA, n = 405 | Pooled studies, n = 888 | |||
---|---|---|---|---|---|---|
Mean (95% CI) | P | Mean (95% CI) | P | Mean (95% CI) | P | |
CYP2A6 NM | 15.6 (14.2–17.1) | 0.40 | 17.1 (15.9–18.3) | 0.04 | 16.3 (15.4–17.3) | 0.04 |
CYP2A6 RM | 14.6 (12.9–16.2) | 15.4 (13.9–16.9) | 14.9 (13.8–16.1) |
CYP2A6 NM, predicted normal CYP2A6 metabolic activity; CYP2A6 RM, predicted reduced CYP2A6 metabolic activity.
aCigarettes per day is not normally distributed and P values were calculated with a non-parametric Wilcoxon rank-sum test.