Table 4 Prediction of cotinine from puffing measures in FM and RYO cigarette smokers*
Cotinine predictorsTotal sampleFM†RYO‡
(n = 131)(n = 110)(n = 20)
Self-reported puffingR2 = 0.046R2 = 0.04R2 = 0.064
p = 0.077NSNS
CreSS puffing parametersR2 = 0.106§R2 = 0.125§R2 = 0.162
p = 0.005p = 0.005NS

  • FM, factory-made cigarette; RYO, roll-your-own cigarette.*Controlling for age, sex, dependence, body-mass-index and deprivation; †Also controlling for ISO nicotine yield; ‡Also controlling for tobacco weight; §One case missing.