Table 2

Demographic characteristics (SIDS vs controls)

CharacteristicCategorySIDSControlsOR (95% CI)P value
n/N%n/N%
GenderMale33/6055.090/19446.41.41 (0.79 to 2.53)0.24
EthnicityNon-white*6/6010.037/19419.10.47 (0.19 to 1.18)0.11
Maternal education≤GCSE†30/6050.032/19416.55.06 (2.69 to 9.53)<0.0001
Maternal age≤22 years‡6/6010.016/1948.21.51 (0.50 to 4.54)0.46
Paternal age≤25 years‡4/547.422/18611.80.60 (0.20 to 1.81)0.36
Maternal smokingIn pregnancy12/6020.019/1939.82.29 (1.04 to 5.05)0.04
Maternal smokingAfter pregnancy15/6025.018/1929.43.22 (1.51 to 6.89)0.003
Paternal smokingYes11/5520.020/18211.02.03 (0.90 to 4.54)0.09
Parity4+ children8/6013.313/1946.72.14 (0.84 to 5.45)0.10
Support statusNo partner5/608.37/1943.62.43 (0.74 to 7.96)0.14
Gestation<37 weeks9/6015.03/1941.511.24 (2.93 to 43.02)0.0004
Birth weight<2500 g11/6018.36/1943.17.03 (2.48 to 19.97)0.0002
Multiple birthTwin or triplet5/60*8.32/1941.08.73 (1.65 to 46.22)0.01
NICUAdmitted10/6016.79/1944.64.11 (1.59 to 10.66)0.004
  • *SIDS (3 mixed race, 2 Asian, 1 black), Controls (21 mixed race, 10 Asian, 4 black, 2 other).

  • †Highest educational qualification of mother was the General Certificate of Secondary Education (GCSE) (awarded at 16 years) or below.

  • ‡Cut-off based on 10% youngest of the age distribution from all the data.

  • NICU, neonatal intensive care unit; SIDS, sudden infant death syndrome.