| [RESEARCH] Birth order of twins and risk of perinatal death related to delivery in En -
02-03-2007, 02:20 AM
Objective To determine the effect of birth order on the risk of perinatal death in twin pregnancies.
Design Retrospective cohort study.
Setting England, Northern Ireland, and Wales, 1994-2003.
Participants 1377 twin pregnancies with one intrapartum stillbirth or neonatal death from causes other than congenital abnormality and one surviving infant.
Main outcome measures The risk of perinatal death in the first and second twin estimated with conditional logistic regression.
Results There was no association between birth order and the risk of death overall (odds ratio 1.0, 95% confidence interval 0.9 to 1.1). However, there was a highly significant interaction with gestational age (P
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