Mortality for White Singleton Infants with Heavily Smoking Mothers. (a) Estimated birthweight-specific mortality curves are presented for each component of a 4-component normal mixture model, along with model-implied mortality (a superposition of the estimated birthweight-specific mortality curves) and empirical mortality (crude rates in 100 g bins). The results are based on a single sample of size 50,000 from the population of white singletons born to heavily smoking mothers. (b) and (c) Corresponding results are displayed for a contaminated normal model and a 2-component normal mixture model. (d) Estimated birthweight specific-mortality curves are presented for each component of a 4-component normal mixture model, along with confidence bounds determined by Equations (6) and (7) with C
0 = 4.0 and φ = .2465 based on 25 samples of size 50,000.