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  • Title: Relationship between epidemiologic risk factors and clinicopathologic findings in the sudden infant death syndrome.
    Author: Haas JE, Taylor JA, Bergman AB, van Belle G, Felgenhauer JL, Siebert JR, Benjamin DR.
    Journal: Pediatrics; 1993 Jan; 91(1):106-12. PubMed ID: 8416472.
    Abstract:
    The risk of sudden infant death syndrome (SIDS) is said to be enhanced by factors such as prematurity, low birth weight, and perinatal distress. The significance of risk factors for SIDS research was questioned because the majority of SIDS victims seem to lack them. Therefore, postmortem records of 1144 infants who died suddenly and unexpectedly in King County, Washington, over a 25-year period were studied. Deaths were classified as "explained" if a cause was apparent, "classic" SIDS if the history and autopsy were unrevealing or, where the diagnosis of SIDS was doubtful, as "probable" or "possible" SIDS. The infants' birth certificates were compared with those of 3647 infants born during a similar period. Seventy-nine deaths (7%) were explained. The 1065 previously certified as SIDS were reclassified classic SIDS (82%), probable SIDS (13%), and possible SIDS (5%). Low birth weight, small size for gestational age, prematurity, and low 5-minute Apgar scores each form a "continuum"; the possible-SIDS group had the highest proportion of such infants, followed by the probable- and classic-SIDS groups, which exhibit extensive overlap with the control population. A 5-minute Apgar score of less than 7 and delayed postnatal growth rate are not risk factors for classic SIDS. Risk factors are more prevalent in SIDS infants where the diagnosis may be doubtful. The great majority of SIDS victims possess fewer risk factors. To avoid the bias of confounding variables, SIDS research should focus on as "pure" a SIDS population as is possible.
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