Stillbirth in diabetic versus non-diabetic twin pregnancies, U.S. matched multiple birth data 1995-2000 [16].

HR=Hazard ratio; CI= confidence interval *Hazard ratios adjusted for maternal race, age, education, marital status, parity, smoking, other maternal major illnesses, fetal sex, mode of delivery and twin-cluster level dependence in Cox proportional hazard models. ʃGestational age group-specific mortality rates and hazard ratios were calculated using the fetuses-at-risk denominator including all fetuses at risk of death (both born and unborn babies).ʂP value in test for interaction with diabetes in pregnancy in relation to the risk of stillbirth.