Table 1

Demographics and pregnancy/birth events

BBA
(n=4945)
Non-BBA
(n=1 092 708)
P values
Maternal age*29.9 (5.79)30.4 (5.60)<0.001
Primiparous13.3%42.3%<0.001
Australian born74.2%70.6%<0.001
Hypertension1.9%6.8%<0.001
Diabetes3.1%5.3%<0.001
Private patient5.6%23.8%<0.001
Weeks gestation at birth*38.3 (3.21)38.9 (2.23)<0.001
Premature birth (<37 weeks)12.5%7.3%<0.001
  • *Mean and SD.

  • BBA, born before arrival.