Table 4

Neonatal outcomes according to age group

Maternal age in years
13–1516–1718–19All teenagers25–29
N8412345987730551 142
Extremely preterm <28 wM3
 n (%)2 (2.4)3 (0.2)23 (0.4)28 (0.4)149 (0.3)
 OR (95% CI)8.5 (2.1 to 35.1)0.8 (0.3 to 2.7)1.3 (0.9 to 2.1)1.3 (0.9 to 2.0)
 Adjusted OR (95% CI)5.4 (0.7 to 41.5)0.3 (0.0 to 2.4)1.1 (0.6 to 1.9)1.0 (0.6 to 1.7)1 (Ref.)
Preterm <37 wM2
 n (%)11 (13.1)68 (5.5)296 (4.9)375 (5.1)2440 (4.8)
 OR (95% CI) 3.0 (1.6 to 5.7)1.1 (0.9 to 1.5)1.0 (0.9 to 1.2)1.1 (1.0 to 1.2)
 Adjusted OR (95% CI)2.5 (1.2 to 5.3)1.0 (0.8 to 1.4) 0.9 (0.8 to 1.1)1.0 (0.8 to 1.1)1 (Ref.)
SGAM1
 n (%)2 (2.4)52 (4.2)199 (3.3)253 (3.5)1262 (2.5)
 OR (95% CI) 0.9 (0.2 to 3.5)1.7 (1.3 to 2.3)1.4 (1.2 to 1.6)1.4 (1.2 to 1.6)
 Adjusted OR (95% CI)0.5 (0.1 to 2.1)1.2 (0.9 to 1.6)1.0 (0.8 to 1.1)1.0 (0.8 to 1.2)1 (Ref.)
Intensive careM4
 n (%)19 (22.6)138 (11.2)654 (10.9)811 (11.1)5566 (10.9)
 OR (95% CI)2.4 (1.4 to 4.0)1.0 (0.9 to 1.2)1.0 (0.9 to 1.1)1.0 (0.9 to 1.1)
 Adjusted OR (95% CI)1.9 (1.0 to 3.4)0.9 (0.7 to 1.1)0.9 (0.8 to 1.0)0.9 (0.8 to 1.0)1 (Ref.)
Stillbirth/neonatal deathM5
 n (%)2 (2.4)4 (0.3)34 (0.6)40 (0.5)180 (0.4)
 OR (95% CI)6.9 (1.7 to 28.3)0.9 (0.3 to 2.5)1.6 (1.1 to 2.3)1.6 (1.1 to 2.2)
 Adjusted OR (95% CI)0.4 (0.0 to 5.1)M60.6 (0.1 to 2.7)1.4 (0.8 to 2.4)1.2 (0.7 to 2.1)1 (Ref.)
  • All the variables are adjusted according to multivariate models:

  • M1: Demographic variables (table 1—history of spontaneous abortions)+adequacy of prenatal care, gestational diabetes, PIH, placental abruption, chorioamnionitis, pre-eclampsia, eclampsia.

  • M2: M1+anaemia+history of spontaneous abortions.

  • M3: M2—misuse of alcohol or drugs.

  • M4: M1+preterm birth and IUGR.

  • M5: M4—(misuse of alcohol or drugs and pre-existing hypertension).

  • M6: M5—(BMI and pre-existing diabetes).

  • BMI, body mass index; PIH, pregnancy-induced hypertension; SGA, small-for-gestational-age.