Total Ultrasound Cohort Mean ± SD or n(%) Total British Columbia Population Mean ± SD or n(%)
N 3,418 154,986
Maternal age (years) 32.7 ±5.4 30.1 ±5.6
Nulliparous 1,708 (50.0%) 70,247 (45.3%)
Type of labour    induced 883 (25.8%) 33,287 (21.5%)
  none 621 (18.2%) 19,648 (12.7%)
  spontaneous 1,914 (56.0%) 102,050 (65.8%)
Mode of delivery elective CS 445 (13.0%) 16,594 (10.7%)
  emergency CS 785 (23.0%) 27,456 (17.8%)
  spontaneous vaginal 1,791 (52.4%) 94,446 (60.9%)
  operative vaginal 397 (11.6%) 16,482 (10.6%)
GA at delivery (completed weeks) 38.1 ±2.3 38.9 ±1.7
Female 1,714 (50.1%) 75,590 (48.8%)
Birth weight (g) 3244.8 ±623.0 3455.7 ±520.3
APGAR at 5 minutes <7 27 (0.8%) 1,851 (1.2%)
EDI total score  Median (IQR) 41.7 (35.5 - 46.3) 41.5 (35.5 - 46.1)
Bottom 10% of one or more EDI subscales 1,018 (29.8%) 46,104 (29.7%)
Designated Special Needs 135 (3.9%) 4,142 (2.7%)