PEDIATRICS Vol. 103 No. 5 May 1999, pp. 968-974
Received Jun 23, 1998; accepted Oct 23, 1998.
From the National Institute of Child Health and Human Development, Bethesda, Maryland.
Objective To describe risk factors for injury death among infants in the United States by the specific external cause of death.
Methods. Data were analyzed from the US-linked birth/infant death files for the years 1983-1991. Potential risk factors for injury death were identified from birth certificate data and included both maternal and infant factors. Injury rates were calculated by external cause of death. Characteristics of infants who died from an injury were compared with those of the entire birth cohort. The independent effect of potential risk factors was assessed in multivariate analyses using a case-control study design.
Results. A total of 10 370 injury deaths were identified
over the 9-year study period (29.72/100 000 live births). The leading
causes of death were homicide, suffocation, motor vehicle crashes, and choking (inhalation of food or objects). There was no significant temporal trend in the overall rate of injury death; however, this was
because significant increases in the rates of death from homicide (6.4%/year) and mechanical suffocation (3.7%/year) were offset by
decreases in rates of death from fires (
4.7%/year) and choking (
4.6%/year). In adjusted analyses, infants born to mothers with no
prenatal care, <12 years of education, two or more previous live
births, Native American race, or <20 years of age were at twice the
risk of injury death compared with the lowest risk groups (initiation
of prenatal care in the first trimester,
16 years of education, no
previous live births, white, or
25 years of age). When analyzed by
the specific cause of death, the factors that were associated most
strongly with death varied. For example, Native Americans were at
greatest risk of a motor vehicle related death (compared with whites:
OR: 3.6; 95% CI: 1.8-7.1), and infants with birth weights of <1500 g
were at greatest risk of death attributable to inhalation of food
(compared with
2500 g: OR: 9.6; 95% CI: 3.3-28.0) or objects
(OR: 11.8; 95% CI: 4.5-30.5).
Conclusion. A number of sociodemographic characteristics are associated with an increased risk of injury-related death in infants. The strength of associations between specific risk factors and death varies with the external cause of death, thus identifying high-risk subgroups for targeting of cause-specific interventions and simultaneously increasing our understanding of the individual and societal mechanisms underlying these tragedies.infant, injury, suffocation, motor vehicle, homicide, drowning, inhalation, fire. .
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