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PEDIATRICS Vol. 110 No. 4 October 2002, pp. 772-780
The Contribution of Prone Sleeping Position to the Racial Disparity in
Sudden Infant Death Syndrome: The Chicago Infant Mortality Study
Fern R. Hauck, MD, MS*, Cathryn Merrick
Moore, CDA*, Stanislaw M. Herman, PhD*,
Mark Donovan, MS*, Mitra Kalelkar, MD,
Katherine Kaufer Christoffel, MD, MPH,
Howard J. Hoffman, MA¶ and Diane Rowley, MD, MPH||
* Department of Family Medicine, Loyola University Chicago Stritch
School of Medicine, Maywood, Illinois Office of the
Medical Examiner of Cook County, Chicago, Illinois Childrens Memorial Hospital
and Departments of Pediatrics and Preventive Medicine, Northwestern University
Medical School, Chicago, Illinois ¶ Epidemiology, Statistics and Data Systems Branch, National
Institute on Deafness and Other Communication Disorders, Bethesda, Maryland || Division of Reproductive Health, Centers for Disease Control and
Prevention, Atlanta, Georgia
Background. Rates of sudden infant death syndrome (SIDS) areover twice as high among African Americans compared with Caucasians.Little is known, however, about the relationship between prone
sleeping, other sleep environment factors, and the risk of SIDSin
the United States and how differences in risk factors mayaccount for
disparities in mortality.
Objective. To assess the contribution of prone sleeping positionand other potential risk factors to SIDS risk in a primarily
high-risk, urban African American population.
Design, Setting, and Population. Case-control study consistingof 260 infants ages birth to 1 year who died of SIDS between
November 1993 and April 1996. The control group consists ofan equal
number of infants matched on race, age, and birth weight.
Prospectively collected data from the death scene investigationand a
follow-up home interview for case infants were comparedwith
equivalent questions for living control participants toidentify risk
factors for SIDS.
Main Outcome Measures. Risk of SIDS related to prone sleepingposition adjusting for potential confounding variables and otherrisk factors for SIDS, and comparisons by race-ethnicity.
Results. Three quarters of the SIDS infants were African American.There was more than a twofold increased risk of SIDS associated
with being placed prone for last sleep compared with the nonprone
positions (odds ratio [OR]: 2.4; 95% confidence interval [CI]:
1.63.7). This OR increased after adjusting for potentialconfounding
variables and other sleep environment factors (OR:4.0; 95% CI:
1.88.8). Differences were found for AfricanAmericans compared with
others (OR: 1.8; 95% CI: 1.22.6and OR: 10.3, 95% CI: 10.3
[3.233.8, respectively]).The population attributable risk was 31%.
Fewer case mothers(46%) than control mothers (64%) reported being
advised aboutsleep position in the hospital after delivery. Of those
advised,a similar proportion of case mothers as control mothers wereincorrectly told or recalled being told to use the prone position,but prone was recommended in a higher proportion of black mothers(cases and controls combined) compared with nonblack mothers.
Conclusions. Prone sleeping was found to be a significant riskfactor for SIDS in this primarily African American urban sample,and approximately one third of the SIDS deaths could be attributedto this factor. Greater and more effective educational outreach
must be extended to African American families and the health
personnel serving them to reduce prone prevalence during sleep,which
appears, in part, to contribute to the higher rates ofSIDS among
African American infants.
Key Words: sudden infant death infant care African
Americans sleep
Abbreviations: SIDS, sudden infant death syndrome OR, odds
ratio CI, confidence interval SD, standard deviation
Received for publication Aug 14, 2000; accepted Apr 26, 2002.
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