Table 1

Epidemiological characteristics of SIDS cases in three studies in Sweden

StudyNorveniusWennergren et alNESS/Sweden
1973–1977 + 19791984–19861992–1995
(n = 334)(n = 70)(n = 117)p value
SIDS incidence (per 1000 live births)0.50.90.6
Weekends (Sat + Sun) (%)38.036.80.81
Maternal age <20 years (%)13.65.10.014
Cohabitation91.089.70.68
Parity 3+ (%)28.441.00.012
Neonatal ward (%)16.529.90.002
Birth weight <2500 g (%)3.822.2<0.001
Gestational age <38 weeks (%)14.729.1<0.001
Multiple births (%)4.29.41-150 0.03
Previous ALTE (%)4.31.41-151/4.31-152 6.00.43
Place of death outdoors (%)11.117.09.40.25
Place of death in car (%)9.612.01.70.014
Recent cold (%)39.035.00.63
  • 1-150 Twin or triplet.

  • 1-151 True ALTE.

  • 1-152 Possible ALTE.