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Table 3 Performance of the Scandinavian Neurotrauma Committee (SNC) guidelines in the validation cohort (n = 19,007)

From: External validation of the Scandinavian guidelines for management of minimal, mild and moderate head injuries in children

Outcome Neurosurgerya ciTBIa Brain injury on CTa
SNC CT or observation, with outcome 32 179 262
SNC CT or observation, without outcome 7921 7775 7692
SNC discharge, with outcome 0 4 14
SNC discharge, without outcome 11,052 11,049 11,039
Sensitivity (95% CI) 100% (89.1–100) 97.8% (94.5–99.4) 94.9% (91.6–97.2)
Specificity (95% CI) 58.3% (57.5–59.0) 58.7% (58.0–59.4) 58.9% (58.2–59.6)
PPV (95% CI) 0.4% (0.3–0.6) 2.3% (1.9–2.6) 3.3% (2.9–3.7)
NPV (95% CI) 100% (100–100) 100% (99.9–100) 99.9% (99.8–99.9)
  1. CT computed tomography, PPV positive predictive value, NPV negative predictive value, ciTBI clinically important traumatic brain injury
  2. aSee text for detailed definitions