Table 6

Accuracy of the PECARN clinical decision rule in the validation group

SensitivitySpecificityNegative predictive valuePositive predictive value
Clinically important traumatic brain injury
 PECARN <2 years25/25, 100.0% (86.3 to 100)1176/2191, 53.7% (51.6 to 55.8)1176/1176, 100.0% (99.7 to 100)25/1040, 2.4% (1.6 to 3.5)
 PECARN ≥2 years61/63, 96.8% (89.0 to 99.6)3798/6348, 59.8% (58.6 to 61.0)3798/3800, 99.95% (99.81 to 99.99)61/2611, 2.3% (1.8 to 3.0)
CT visible brain injury
 PECARN <2 years68/68, 100% (94.7 to 100)1176/2148, 54.7%*1176/1176, 100% (97.8 to 100)68/1040, 6.5%*
 PECARN ≥2 years109/116, 94% (88.0 to 97.5)3793/6295, 60.3%*3793/3800, 99.8% (96.8 to 99.4)109/2611, 4.2%*
  • Values in parentheses are 95% CIs.

  • * These have been calculated using data in the original reports.

  • PECARN, Paediatric Emergency Care Applied Research Network.