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We studied the relationship between
cigarettes smoked per day and urine cotinine concentration among women. We limited this
analysis to self-reported active smokers in order to minimize the contribution of active
smokers falsely reporting that they had quit. We first used crude data to generate a
"box-and-whisker plot" of corresponding values of cigarettes smoked per day and
urine cotinine concentration. We then used general linear models to quantify the amount
of cotinine variability explained by self-reported cigarettes smoked per day. We used r2
as the measure of variability and adjusted for maternal age, education, body mass
index, state of residence, passive tobacco exposure, and weeks of gestation. |
