78 The effect of placental chorionicity on early childhood mental and motor development of twins

OBJECTIVE: To evaluate factors affecting birth charges for mother and newborns in twin pregnancies.STUDY DESIGN: As part of an ongoing collaborative study of twins, clinical and financial data was obtained on 1080 pregnancies from 1995 to present from four medical centers in Bahinmre, MD, Miami, EL, Ann Arbor, MI, and Charleston, SC.Regression modeling was used to evaluate the effect of maternal and neonatal factors on birth charges. RESULTS:The study population was 51% white, 46% _>30 yrs of age; 32% overweight or obese; 45% primiparas, 24% infertility treatments, 16% mono-