highly significantp = 0.005
Product Use Correlations between saliva cotinine levels and number of cartridges/day were highly significant for study groups A and B, at week-6 (Rho = 0.90 for group A, p = 0.005; Rho = 0.74 for group B, p = 0.006, Spearman’s rank correlation) and at week-12 (Rho = 0.93 for group A, p<0.003; Rho = 0.95 for group B, p<0.0004).