Table 5.

Performance of the CATCH rule: A) Using the 4 high-risk signs, sensitivity was 100.0% (95% CI 86.2% to 100.0%) and specificity was 70.2% (95% CI 68.6% to 71.6%); 30.2% of patients would undergo CT scanning. B) Using the 4 high-risk and 3 medium-risk signs, sensitivity was 98.1% (95% CI 94.6% to 99.4%) and specificity was 50.1% (95% CI 48.5% to 51.7%); 51.9% of patients would undergo CT scanning.

A)
RESULT
NEEDED NEUROLOGIC INTERVENTIONDID NOT NEED NEUROLOGIC INTERVENTION
Positive (≥ 1 high-risk factor)241144
Negative (no high-risk factors)02698
B)
RESULT
NEEDED NEUROLOGIC INTERVENTIONDID NOT NEED NEUROLOGIC INTERVENTION
Positive (≥ 1 high-risk factor)1561851
Negative (no high-risk factors)31856
  • CATCH—Canadian Assessment of Tomography for Childhood Head Injury, CT—computed tomography.

  • Data from Osmond et al.38