Table 2.

Performance of the PECARN clinical decision rules by age and combinated

	ciTBI		Sensitivity	Specificity	Negative predictive value	Positive predictive value
PECARN ciTBI risk group	Yes	No	% (95 % CI)	% (95 % CI)	% (95 % CI)	% (95 % CI)
Children <2 years
Intermediate or high risk	3	151	100 (29–100)	64 (59–69)	100 (99–100)	2 (0–6)
Very low risk	0	267
Children ≥2 years
Intermediate or high risk	6	298	100 (54–100)	72 (69–75)	100 (99–100)	2 (1–4)
Very low risk	0	774
Overall
Intermediate or high risk	9	449	100 (66–100)	70 (68–72)	100 (99–100)	2 (1–4)
Very low risk	0	1041

ciTBI clinically-important traumatic brain injury, PECARN Pediatric Emergency Care Applied Research Network, CI confidence interval