TABLE 1.

Characteristics of the Study Population, Expressed as Frequencies for Categorical Variables, and Means and/or Medians for Continuous Variables

CharacteristicSummary Statistic
Age
 Mean (SD)6.4 mo (5.6 mo)
 Median (range)4.7 mo (0.7–23.9 mo)
Sex
 Male62%
 Female38%
Race
 White31%
 Black58%
 Other11%
Maternal age
 Mean (SD)24.3 y (6.3 y)
Prior child welfare reports
 Child8%
 Siblings14%
 Either18%
Household composition
 Single parent48%
 2-parent41%
 Other11%
Insurance status of family
 Private insurance17%
 None or medicaid83%
Growth (median % for age)
 Weight (range)35th% (1–99th%)
 Head circumference (range)28th% (1–99th%)
Failure to thrive (weight <5th percentile)19%
Injuries
 Rib fractures34%
 Multiple fractures59%
 Facial injury35%
Screened with brain imaging79%
  • SD indicates standard deviation.