A population-based birth cohort including 296 consecutive type 1 diabetic b
irths in a geographically defined catchment area was used to evaluate facto
rs predicting poor perinatal and neonatal outcome. Though perinatal mortali
ty has decreased (17.1/1000 births at 28 or more weeks of gestation), the n
eonatal morbidity rate still remains high despite improved maternal metabol
ic control and developed antepartum surveillance. Poor glycemic control dur
ing the first weeks of pregnancy was the most important risk factor (relati
ve risk (RR) 2.91; 95% confidence interval (CI) 1.29-6.55) predicting adver
se neonatal events such as long (>10 days) stay in the neonatal unit, malfo
rmation or perinatal death. The risk was further increased in cases of seve
re diabetes (White class F-R; RR 2.75; 95% CI 1.59-4.76) and primiparity(RR
1.64; 95% CI 1.02-2.65). Hy evaluating these risk factors at the first ant
enatal visit, a subgroup with a particular need of counselling and intensiv
e fete-maternal monitoring can be identified. (C) 2000 Elsevier Science Ire
land Ltd. kll rights reserved.