Table 4

Neonatal outcome data in singleton primiparous women in the period 1992–2010 in relation to maternal age group

CharacteristicsCrude OR (95% CI)aOR (95% CI)*Crude OR (95% CI)aOR (95% CI)*Crude OR (95% CI)aOR (95% CI)*
<17 years17–19 years20–24 years
Fetal distress0.62 (0.31 to 1.24)0.52 (0.22 to 1.26)0.76 (0.63 to 0.91)0.63 (0.51 to 0.79)0.93 (0.86 to 1.01)0.79 (0.72 to 0.91)
Aspiration of meconiumNANA0.47 (0.32 to 0.67)0.46 (0.31 to 0.70)0.90 (0.80 to 1.03)0.93 (0.81 to 1.07)
Shoulder dystocia†0.45 (0.11 to 1.82)0.32(0.05 to 2.29)0.74 (0.58 to 0.90)0.74 (0.52 to 1.07)1.01 (0.88 to 1.16)1.00 (0.86 to 1.16)
Stillbirth0.99 (0.47 to 2.08)0.58 (0.19 to 1.80)1.15 (0.94 to 1.42)0.97 (0.75 to 1.25)1.03 (0.93 to 1.15)0.98 (0.87 to 1.11)
SGA1.32 (1.07 to 1.63)1.00 (0.78 to 1.28)1.31 (1.23 to 1.40)1.01 (0.94 to 1.09)1.11 (1.07 to 1.14)1.00 (0.96 to 1.04)
LGA1.01 (0.75 to 1.34)1.08 (0.76 to 1.53)0.92 (0.84 to 1.00)1.03 (0.94 to 1.14)1.05 (1.00 to 1.09)1.05 (1.00 to 1.10)
Apgar score <7 at 5 min1.31 (0.96 to 1.77)1.30 (0.91 to 1.86)0.92 (0.83 to 1.03)0.92 (0.81 to 1.11)0.93 (0.89 to 0.99)0.93 (0.88 to 0.98)
30–34 years35–39 years40+ years
Fetal distress0.96 (0.89 to 1.04)1.23 (1.13 to 1.35)1.14 (1.02 to 1.27)1.51 (1.33 to 1.72)0.98 (0.75 to 1.28)1.60 (1.20 to 2.13)
Aspiration of meconium1.27 (1.13 to 1.42)1.36 (1.20 to 1.54)1.42 (1.21 to 1.67)1.48 (1.24 to 1.77)1.83 (1.34 to 2.51)1.82 (1.28 to 2.58)
Shoulder dystocia†1.18 (1.04 to 1.35)1.13 (0.90 to 1.41)1.13 (0.91 to 1.39)1.13 (0.91 to 1.41)1.47 (0.93 to 2.33)1.27 (0.76 to 2.12)
Stillbirth1.26 (1.14 to 1.38)1.25 (1.12 to 1.39)1.85 (1.64 to 2.10)1.72 (1.49 to 1.99)2.77 (2.22 to 3.46)2.34 (1.80 to 3.03)
SGA1.20 (1.16 to 1.24)1.24 (1.20 to 1.28)1.63 (1.56 to 1.70)1.65 (1.58 to 1.73)2.04 (1.87 to 2.22)2.06 (1.87 to 2.26)
LGA0.94 (0.91 to 0.98)0.94 (0.90 to 0.98)1.03 (0.97 to 1.09)0.97 (0.91 to 1.04)1.07 (0.93 to 1.22)0.94 (0.81 to 1.09)
Apgar score <7 at 5 min1.18 (1.13 to 1.24)1.18 (1.12 to 1.24)1.47 (1.38 to 1.56)1.39 (1.29 to 1.49)1.65 (1.44 to 1.88)1.51 (1.30 to 1.75)
  • Reference group: maternal age 25–29 years.

  • *Adjusted for maternal body mass index and smoking habits at first antenatal care visit and year of birth.

  • †Shoulder dystocia among vaginal delivered women.

  • aOR, adjusted OR; LGA, large-for-gestational age; NA, not applicable; SGA, small-for-gestational age.