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Evaluation of the Oxford and Sheffield SIDS risk prediction scores
J G Brooks1, P J Fleming, P J Berry
1Department of Pediatrics, University of Rochester, New York.
Insights
The Oxford and Sheffield birth scores show limited clinical usefulness for identifying infants at high risk of Sudden Infant Death Syndrome (SIDS). Their low sensitivity means many SIDS cases are missed, questioning their use in resource allocation for prevention.
Area of Science:
- Pediatrics
- Public Health
- Epidemiology
Background:
- Sudden Infant Death Syndrome (SIDS) remains a significant concern in infant mortality.
- Accurate identification of infants at high risk is crucial for targeted prevention strategies.
Purpose of the Study:
- To assess the clinical utility, specifically sensitivity and specificity, of the Oxford and Sheffield birth scores.
- To determine if these scores can reliably identify infants at high risk for SIDS.
Main Methods:
- Retrospective review of medical records for SIDS cases and living control infants.
- Inclusion of 140 SIDS infants and 637 control infants born between 1983 and 1987.
Main Results:
- SIDS incidence was 2.85 per 1,000 live births.
- Oxford score sensitivity: 0.55, specificity: 0.78. Sheffield score sensitivity: 0.35, specificity: 0.89.
- High-risk infants identified by Oxford had a SIDS risk of 7.3/1,000; by Sheffield, 9.3/1,000.
Conclusions:
- Neither scoring system demonstrates sufficient accuracy for clinical use in SIDS prevention.
- A significant proportion of SIDS cases occur in infants classified as low-risk by these scores.
- Clinical application for resource allocation solely for SIDS prevention is not justified based on current data.
Study Objective:
To evaluate the clinical usefulness (sensitivity and specificity) of the Oxford and Sheffield birth scores for prospective identification of infants at high risk of SIDS.
Design:
Retrospective medical record reviews of prospectively identified, autopsy-validated SIDS and living control infants.
Study Subjects:
Consecutive sample of 140 infants, born between 1/1/83 and 12/31/87, who died suddenly and unexpectedly in the Avon Area Health Authority in southwest England between 1/1/84 and 12/31/88. Seventeen of the cases were excluded: 6 because they lacked adequate clinical records, 11 because they were not SIDS. The 637 control infants were comprised of every 80th delivery between 1/1/83 and 12/31/87 in the three major hospitals in the area.
Results:
SIDS incidence was 2.85/1,000 live births. Using standard cut scores to define high SIDS risk (2.0 for Oxford and 500 for Sheffield), sensitivities were 0.55 and 0.35 and specificities were 0.78 and 0.89 for the Oxford and Sheffield scores, respectively. SIDS risk for infants in the high risk group was 7.3/1,000 (Oxford) and 9.3/1,000 (Sheffield).
Conclusions:
Since there is no intervention with proven efficacy for SIDS prevention, and since approximately one half of SIDS cases occur in low risk groups, clinical use of these scoring systems for allocation of health care resources or personnel for the sole purpose of SIDS prevention is not justified.