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Sudden infant death syndrome among extremely preterm infants: United States 1997-1999
1Department of Pediatrics, University of Texas Medical Branch, Galveston, TX 77555-0526, USA.
Insights
Very preterm infants face higher sudden infant death syndrome (SIDS) risks, primarily linked to sociodemographic factors like maternal education and age, not medical conditions. Environmental and behavioral modifications are key to reducing SIDS in this vulnerable population.
Area of Science:
- Neonatalogy
- Perinatal Epidemiology
- Public Health
Background:
- Preterm infants exhibit a higher risk of sudden infant death syndrome (SIDS) compared to full-term infants.
- The underlying reasons for this increased SIDS susceptibility in preterm infants remain unclear.
Purpose of the Study:
- To identify demographic and medical characteristics associated with SIDS in postneonatal infants born between 24 to 32 weeks gestation.
- To compare these characteristics between preterm infants who died of SIDS and those who survived or died of other causes.
Main Methods:
- Analysis of United States linked birth and death certificate data from 1997 to 1999.
- Inclusion criteria: infants 24-32 weeks gestation, weighing 500-2500g.
- Comparison groups: postneonatal SIDS deaths, other postneonatal deaths, and survivors.
Main Results:
- Infants dying of SIDS were more likely to have mothers with less than 12 years of education (OR=2.5), mothers aged 17 or younger (OR=2.0), and mothers with over 3 previous pregnancies (OR=2.6).
- These sociodemographic factors remained significant risk factors when compared to infants who died of other postneonatal causes.
- No significant medical risk factors (e.g., breech presentation, low Apgar score, prolonged ventilation) were identified as increasing SIDS risk in this cohort.
Conclusions:
- Sociodemographic factors, rather than medical characteristics, are significantly associated with SIDS risk in very preterm infants (24-32 weeks gestation).
- Interventions focused on environmental modifications and parental behavior are recommended to mitigate SIDS risk in this population.
Background:
Preterm infants have been reported to be at higher risk than term infants for sudden infant death syndrome (SIDS). Reasons for this higher risk are not clear.
Objective:
The objective of this study was to analyze medical and demographic characteristics among infants 24 to 32 weeks gestation to identify characteristics more prevalent among infants dying of SIDS in the postneonatal period than among infants of similar gestation who survived or who died of other causes in the postneonatal period.
Design/Methods:
United States linked birth and death certificate period data for 1997 to 1999 were used for this analysis. The population used was limited to infants 24 to 32 weeks gestation weighing 500 to 2500 g. SIDS deaths were limited to the postneonatal period and compared to survivors and infants dying in the postneonatal period of other causes.
Results:
There were 469 postneonatal SIDS deaths with complete data (rate=2.2/1000 live births surviving > or =28 days); 3950 other postneonatal deaths (rate=18.7/1000) and 206,640 survivors. Compared with survivors, infants dying of SIDS were more likely to be born to mothers with <12 years of education (odds ratio=2.5, 95% confidence interval (95% CI=1.8, 3.3); be born to mothers < or =17 years of age (OR=2.0, 95% CI=1.4, 2.8); and be born to mothers with >3 previous pregnancies (OR=2.6, 95% CI=1.9, 3.5). Compared with infants dying in the postneonatal period of other causes, these same demographic factors continued to be significant risk factors for SIDS. There were no medical risk factors such as breech presentation, abruptio placenta, Apgar score <4 at 5 minutes, or mechanical ventilation for >30 minutes after birth, for which infants dying of SIDS were at greater risk than survivors or infants dying of other causes.
Conclusions:
Risk factors for SIDS among infants 24 to 32 weeks gestation appear to be more associated with sociodemographic characteristics than medical characteristics. This suggests that for the immediate future, the risk for SIDS among very preterm infants will be best addressed through further modification of the environment and parent behavior.
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