Abstract 3977: Relationship of BMI to Change in Smoking Status: the CARDIA study
Though smoking status has an interaction with BMI, the magnitude and significance of the effect had been difficult to assess. The CARDIA study, a longitudinal study designed to assess the progression of cardiovascular risk factors in black and white men and women aged 18–30 years at study onset has conducted 6 exams over 15 years where smoking status, height, and weight were recorded. The purpose of this study was to assess the impact of smoking status on visit to visit change in BMI. At baseline significant but contradictory differences were identified between smokers (S) and non-smokers (N): black male S were leaner than N (1.1 kg/m2) while white female S were heavier (0.8 kg/m2). CARDIA participants (n = 3871) were then divided into 4 groups at each visit (SS (persistent smokers), NN (never smokers), SN (quitters), and NS (starters)) with change in BMI/year calculated using generalized estimating equations. Comparisons were made between the rate of change/year and 0 for each group and between the SN (quitters) group and the others. All race/gender groups except NS (starters) increased BMI from visit to visit and all SN groups increased BMI more than the other 3 (Table⇓). Change in smoking status was associated with rate of BMI change, but those who continued to either smoke or not smoke gained weight at the same rate.