Patterns of Plasma Biomarkers in 28 Children by and Traumatic Brain Injury (TBI) Severity, Age, and Sex Mild TBI: Admission Glasgow Coma Score (GCS): 13 −15, n = 11, Moderate TBI: Admission GCS: 9–12, n = 3, Severe TBI: Admission GCS: 3–8, n = 14 Age groups 0–4 years, 5–9 years, 10–14 years and 15–18 years Median biomarker levels did not vary significantly by TBI severity, age group, or sex