Table 4

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

Obstetric traumaOR
(95% CI)
AOR*
(95% CI)
AOR†
(95% CI)
Severe perineal lacerations0.95 (0.95 to 0.96)0.96 (0.96 to 0.97)0.96 (0.95 to 0.96)
Cervical/high vaginal lacerations0.99 (0.99 to 1.00)1.00 (0.99 to 1.01)1.00 (0.99 to 1.00)
Any severe lacerations0.91 (0.91 to 0.92)0.92 (0.92 to 0.92)0.91 (0.91 to 0.92)
  • 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.