Poisson regression analyses were used to test the relationship between these 5 outcome variables and the past-30 day daily average number of cigarettes smoked, adjusting for medication condition, site, and estimated gestational age at study entry. Estimates are exponentiated parameter estimates. Estimates were calculated at 4 values of the predictor variable of past-30 day daily average number of cigarettes smoked: No cigarette smoking; below-average cigarette smoking, defined as 5.88 cigarettes/day (−1 SD); average cigarette smoking, defined as 13.66 cigarettes/day (Mean); and, above-average cigarette smoking, defined as 21.44 cigarettes/day (+1 SD).