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To determine the current survival rate of singleton living newborns born at gestational age of 24 and 25 weeks, using obstetric factors available to the physician before birth.

Retrospective study of all live births in 13 of 17 Canadian tertiary centres.

All singleton live births without congenital abnormalities.

During the years 1991–1996, data were abstracted from clinical databases and charts of 860 live births, in 13 of the 17 tertiary centres in Canada, all with major neonatal intensive care units. Newborn survival was defined as alive at discharge from neonatal intensive care unit. Abstracted elements included gestational age, maternal antenatal corticosteroid treatment, birthweight, gender, fetal presentation and mode of delivery.

Average survival rates increased from 56.1% at 24 weeks (n = 406) to 68.0% at 25 weeks (n = 454). Survival rates ranged from 53.1 …