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Table 2 Trends in maternal population characteristics, NSW 1999–2004

From: Trends in adverse maternal outcomes during childbirth: a population-based study of severe maternal morbidity

Maternal and pregnancy characteristics 1999 N = 84934% 2004 N = 81381 Change in rate relative to 1999%(95%CI)*
Maternal age    
   <20 years 4.8 4.0 -15.5 (-19.6, -11.4)
   20–34 years 78.2 76.0 -2.8 (-3.3, -2.3)
   ≥ 35 years 17.0 19.9 +17.0 (+14.8, +19.2)
Parity    
   0 41.2 42.5 + 3.3 (+ 2.2, + 4.5)
   1–3 55.4 54.0 -2.5 (-3.4, -1.6)
   ≥ 4 3.5 3.5 -
Smoking 18.9 14.8 -21.9 (-23.8, -20.0)
Delivery hospital (level)    
   Small rural 12.1 10.2 -15.6 (-18.1, -13.1)
   District 29.4 25.8 -12.3 (-13.8, -10.8)
   Tertiary obstetric 40.2 39.6 -1.3 (-2.5, -0.1)
   Private 18.3 24.4 +33.0 (+30.8, +35.1)
Multiple pregnancy 1.5 1.6 -
Previous caesarean birth† 18.3 22.6 +23.7 (+20.9, +26.4)
Hypertensive disorders 10.9 8.9 -18.1 (-20.7, -15.5)
   Preexisting hypertension 0.6 0.6 +12.3 (+ 8.1, +25.4)
   Pregnancy Hypertension 10.3 8.2 -20.2 (-22.9, -17.5)
Diabetes during pregnancy 4.3 4.9 +13.9 (+ 9.2, +18.6)
   Pre-existing diabetes 0.3 0.4 -
   Gestational diabetes 4.0 4.6 +13.5 (+ 8.6, +18.3)
Antepartum haemorrhage 1.6 1.8 +11.7 (+ 4.0, +19.3)
Induction of labour‡ 26.8 28.8 +7.5 (+ 5.7, + 9.2)
Mode of delivery    
   Spontaneous vaginal 69.4 62.4 -10.0 (-10.7, -9.4)
   Instrumental 10.9 10.3 -5.8 (-8.5, -3.1)
   Caesarean section 19.7 27.3 +38.5 (+36.4, +40.5)
Postpartum haemorrhage 6.2 6.8 +10.7 (+ 6.9, +14.6)
  1. * Changes with a significant trend over time χ2 for trend P < 0.01 are reported.
  2. † among who had prior births.
  3. ‡ Excludes caesarean sections prior to labour.