TABLE 1.

Summary Statistics of Key Variables

VariablesInflicted Head Traumas (N = 283)Unintentional Head Traumas (N = 814)
ValueStandard DeviationValueStandard Deviation
Dependent variables
 Length of stay* (mean, in d)8.9010.193.527.01
 Total charges* (mean, in dollars)25 481.2631 421.7210 879.7122 932.13
Independent variables
 Age* (mean, in mo)8.178.3815.6210.65
 Female (proportion)0.410.490.430.50
APR-DRG severity level* (mean)2.550.971.500.82
APR-DRG severity level* (proportion)
 10.140.350.670.47
 20.360.480.210.41
 30.300.460.080.27
 40.200.400.040.21
Death* (proportion)0.100.300.040.19
Pediatric trauma hospital cases* (proportion)0.870.340.760.43
Year of discharge (proportion)
 19930.120.320.110.32
 19940.070.260.170.38
 19950.110.320.130.34
 19960.160.370.130.33
 19970.120.330.140.34
 19980.150.350.120.33
 19990.160.370.100.29
 20000.110.320.100.31
Race/ethnicity (proportion)
 White/non-Hispanic0.500.500.510.50
 Hispanic0.290.450.240.43
 Black/non-Hispanic0.060.240.050.22
 Other race/ethnicity0.030.170.040.19
 Missing race/ethnicity0.120.16
Insurer* (proportion)
 Commercial insurance0.050.220.240.43
 Medicaid0.530.500.300.46
 Managed care (public or private)0.290.450.290.45
 Uninsured0.110.310.150.35
 Other insurance0.030.160.030.16
  • * Indicates P < .05.