Table 2 Oaxaca-Blinder decomposition of the difference in mortality rates for black and white children after severe traumatic brain injury. The observed mortality rate difference was 7.24%. The sum of the estimated contributions was 8.51%. Covariate groups are defined as follows: “Severity” includes AIS scores, GCS scores, ISS scores, numbers of diagnoses, systolic blood pressure in the ED, EMS minutes, ED disposition, and ventilator days. “Mechanism” includes penetrating injury and utilization of protective devices. “Insurance” is limited to payer – commercial or non-commercial. “Demographics” is limited to age group. “Structure and Process” includes bed size, teaching status, and self-transport
Covariate groups | Mortality rate difference (%) | 95% confidence interval mortality rate difference | Fractional contribution |
|---|---|---|---|
Severity | 6.89 | 6.43 to 7.35 | 95.2% |
Mechanism | 0.90 | 0.67 to 1.13 | 12.5% |
Insurance | 0.39 | 0.14 to 0.65 | 5.4% |
Demographics | 0.15 | 0.01 to 0.28 | 2.1% |
Structure and Process | 0.17 | −0.08 to 0.42 | 2.4% |
Total | 8.51 | 7.87 to 9.15 | 117.6% |