The model used was: where RR C is the RR for cigarette smoking, RR P is the RR for product P (cigars, pipe, ST or snuff/snus), BioM C is the mean value of the biomarker for individuals smoking cigarettes, BioM P is the mean value of the biomarker for individuals using product P, is the estimate of the slope relating the log RR ratios to the log biomarker ratios, and \(\varepsilon\) is the error term, assumed to be an independent and identically distributed normal variable with mean 0 and variance 2
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