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Table 2 Estimated probabilities and 95% CI of obstetric and neonatal morbidity according to maternal age adjusted for: obesity, assisted reproductive technology and geographical origin. Probabilities were estimated by modelling the relationship between maternal age and outcome (see Fig. 2)

From: Impact of maternal age on obstetric and neonatal morbidity: a retrospective cohort study

  

Maternal age

 

P 1

< 25

25–34

35–39

40–44

≥ 45

Unfavourable pregnancy outcome

0.06 [0.05–0.08]

0.05 [0.04–0.05]

0.07 [0.06–0.07]

0.09 [0.08–0.11]

0.16 [0.12–0.23]

< 0.001

Hospitalisation during pregnancy a

0.16 [0.14–0.19]

0.11 [0.11–0.12]

0.14 [0.13–0.15]

0.18 [0.16–0.20]

0.28 [0.23–0.34]

< 0.001

Pre-eclampsia

0.01 [0.01–0.02]

0.01 [0.01–0.02]

0.02 [0.01–0.02]

0.02 [0.02–0.03]

0.04 [0.02–0.08]

0.02

Gestational diabetes b

0.01 [0.00–0.01]

0.02 [0.02–0.02]

0.03 [0.03–0.04]

0.05 [0.04–0.06]

0.10 [0.06–0.16]

< 0.001

Caesarean delivery

0.14 [0.13–0.16]

0.18 [0.18–0.19]

0.27 [0.25–0.28]

0.37 [0.34–0.41]

0.62 [0.52–0.71]

< 0.001

Preterm birth

0.08 [0.07–0.10]

0.07 [0.06–0.07]

0.07 [0.07–0.08]

0.08 [0.07–0.10]

0.10 [0.08–0.12]

0.01

Newborn small-for-gestational age

0.18 [0.17–0.21]

0.14 [0.13–0.14]

0.14 [0.13–0.15]

0.18 [0.16–0.21]

0.34 [0.24–0.46]

< 0.001

Newborn transfer c

0.18 [0.16–0.21]

0.12 [0.11–0.12]

0.14 [0.13–0.15]

0.18 [0.16–0.20]

0.29 [0.23–0.36]

< 0.001

  1. 1 test of the association with age as a continuous variable
  2. a more than 1 day
  3. b requiring hospitalisation
  4. c in paediatric unit or neonatal intensive care unit