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 trauma | OR (95% CI) | AOR* (95% CI) | AOR** (95% CI) |
Brain injury | 1.00 (0.96 to 1.04) | 1.01 (0.98 to 1.05) | 1.02 (0.98 to 1.06) |
Fractures | 0.96 (0.95 to 0.98) | 0.97 (0.95 to 0.99) | 0.97 (0.95 to 0.99) |
Nerve injury | 0.99 (0.97 to 1.02) | 1.00 (0.98 to 1.03) | 1.00 (0.98 to 1.03) |
Other severe birth trauma | 0.97 (0.95 to 0.99) | 0.98 (0.96 to 1.00) | 0.98 (0.960 to 1.002) |
Any severe birth trauma | 0.98 (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.