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An 8 year study of risk factors for SIDS: bed-sharing versus non-bed-sharing
C McGarvey1, M McDonnell, K Hamilton
1National Sudden Infant Death Register, George's Hall, The Children's University Hospital, Temple St, Dublin 1, Ireland. cliona.mcgarvey@tsch.ie
Insights
Bed-sharing with infants increases sudden infant death syndrome (SIDS) risks, especially for low birth weight babies or when using excessive bedding. Maternal smoking further elevates these dangers, highlighting the need for safe sleep environments.
Area of Science:
- Pediatric Sleep Safety
- Public Health Research
- Infant Mortality Studies
Background:
- Bed-sharing safety for infants remains a significant concern.
- In Ireland, nearly half of sudden infant death syndrome (SIDS) cases involve bed-sharing.
Purpose of the Study:
- To investigate the impact of bed-sharing on SIDS risk factors in Irish infants.
- To analyze the association between bed-sharing and infant sleep environment characteristics.
Main Methods:
- Conducted an 8-year population-based case-control study (1994-2001).
- Analyzed 287 SIDS cases and 831 matched controls.
- Utilized conditional logistic regression to calculate odds ratios and confidence intervals.
Main Results:
- Bed-sharing increased SIDS risk threefold for low birth weight infants.
- Risk quadrupled with high tog values (> or =10) for bedding and clothing.
- Maternal smoking significantly amplified bed-sharing risks (OR 13.87).
- Bed-sharing infants died younger and were less likely to be found in a prone position.
Conclusions:
- Infant sleeping environments significantly influence SIDS risk factors.
- Bed-sharing exacerbates risks associated with maternal smoking, high tog values, and low birth weight for gestation.
- Safe sleep recommendations must consider these combined risk factors.
Background:
It is unclear if it is safe for babies to bed share with adults. In Ireland 49% of sudden infant death syndrome (SIDS) cases occur when the infant is bed-sharing with an adult.
Objective:
To evaluate the effect of bed-sharing during the last sleep period on risk factors for SIDS in Irish infants.
Design:
An 8 year (1994-2001) population based case control study of 287 SIDS cases and 831 controls matched for date, place of birth, and sleep period. Odds ratios and 95% confidence intervals were calculated by conditional logistic regression.
Results:
The risk associated with bed-sharing was three times greater for infants with low birth weight for gestation (UOR 16.28 v 4.90) and increased fourfold if the combined tog value of clothing and bedding was > or =10 (UOR 9.68 v 2.34). The unadjusted odds ratio for bed-sharing was 13.87 (95% CI 9.58 to 20.09) for infants whose mothers smoked and 2.09 (95% CI 0.98 to 4.39) for non-smokers. Age of death for bed-sharing and sofa-sharing infants (12.8 and 8.3 weeks, respectively) was less than for infants not sharing a sleep surface (21.0 weeks, p<0.001) and fewer bed-sharing cases were found prone (5% v 32%; p = 0.001).
Conclusion:
Risk factors for SIDS vary according to the infant's sleeping environment. The increased risk associated with maternal smoking, high tog value of clothing and bedding, and low z scores of weight for gestation at birth is augmented further by bed-sharing. These factors should be taken into account when considering sleeping arrangements for young infants.
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