Table 4

Adjusted odds ratios of risk factors of SIDS and interaction with time period in Sweden 1973–1996

I. Rising incidenceII. High incidenceIII. Falling incidenceInteraction with time period (p value)
1973–19801981–19921993–1996
(n = 8372)(n = 13 187)(n = 4165)
OR95% CIOR95% CIOR95% CI
Male sex1.41.1, 1.71.51.3, 1.71.20.9, 1.70.39
Maternal age0.08
 ⩽19 years3.12.1, 4.74.03.0, 5.26.73.0, 14.9
 20–24 years1.71.3, 2.21.51.3, 1.82.41.5, 3.6
 25–29 years1.0ref1.0ref1.0ref.
 30–34 years0.80.6, 1.10.70.6, 0.80.60.4, 0.9
 35+ years0.50.3, 0.80.40.3, 0.60.80.5, 1.4
Parity0.13
 11.0ref1.0ref1.0ref
 21.71.3, 2.22.52.1, 2.92.31.5, 3.6
 32.51.8, 3.63.52.9, 4.34.82.9, 7.9
 4+5.63.7, 8.56.24.8, 7.86.53.7, 11.5
SGA2.31.6, 3.42.72.0, 3.62.41.0, 5.60.83
Preterm birth2.11.4, 3.01.81.5, 2.33.92.5, 6.20.012
SGA and preterm birth4.22.1, 8.43.01.8, 5.17.32.7, 19.30.29
  • Data from the Medical Birth Registry of Sweden. Model contained male sex, maternal age, parity, SGA, preterm birth, and combined SGA and preterm birth.