Table 3

Diagnostic indices of mild TBI risk score categorized by risk category

Risk factorsCT positiveCT negativeSensitivity (%)Specificity (%)PPV (%)NPV (%)LR+
Low risk381098.279.725.950.40.4
Moderate risk2638757.183.875.169.53.5
High risk132228.699.698.562.077.3
  • Low risk, mild TBI score <3 points; moderate risk, mild TBI score 3–6 points; high risk, mild TBI score ≥7 points.

  • LR+, likelihood ratio positive; 0.89 and 95% CI 0.87 to 0.91; NPV, negative predictive value; PPV, positive predictive value; TBI, traumatic brain injury.