Table 2

Unadjusted and adjusted ORs expressing the change per year in the risk of birth trauma among  singleton infants, Washington State, USA, 2004–2013

Severe birth traumaOR
(95% CI)
AOR*
(95% CI)
AOR**
(95% CI)
Brain injury1.00
(0.96 to 1.04)
1.01
(0.98 to 1.05)
1.02
(0.98 to 1.06)
Fractures0.96
(0.95 to 0.98)
0.97
(0.95 to 0.99)
0.97
(0.95 to 0.99)
Nerve injury0.99
(0.97 to 1.02)
1.00
(0.98 to 1.03)
1.00
(0.98 to 1.03)
Other severe birth trauma0.97
(0.95 to 0.99)
0.98
(0.96 to 1.00)
0.98
(0.960 to 1.002)
Any severe birth trauma0.98
(0.96 to 0.99)
0.98
(0.97 to 0.99)
0.98
(0.972 to 0.995)
  • Breech delivery was excluded.

  • *Adjusted for temporal changes in mode of delivery.

  • †Adjusted for temporal changes in mode of delivery and other risk factors (parity, body mass index, maternal age, maternal education, race, marital status, assisted conception, hypertension, diabetes mellitus, gestational diabetes, smoking during pregnancy, birth weight, preterm birth, PROM (>12 hours), precipitous labour, prolonged labour, cephalopelvic disproportion, obstructed labour and fetal sex).

  • AOR, adjusted OR; PROM, premature rupture of membranes.