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To identify sociodemographic predictors of infant injury mortality and to compare trends in injury mortality rates for high- and low-risk US infants from 1985 to 1991.

Historical cohort.

The National Center for Health Statistics linked US infants (<1 year) born from 1985 to 1991 with death certificates.

Multivariate regression was used to identify sociodemographic factors associated with injury mortality. The adjusted relative risks (RRs) of maternal age, education, marital status, number of other children, and infant birth weight were used to categorize infants into risk groups. We compared trends in injury rates for the highest and lowest risk groups.

There were 5963 injury deaths and 18.6 million infant years or 32.1 injury deaths per 100 000 infant …