. Author manuscript; available in PMC: 2015 Jul 1.

Published in final edited form as: Pediatr Crit Care Med. 2014 Jul;15(6):554–562. doi: 10.1097/PCC.0000000000000150

Table 3.

Measures of discrimination, calibration, and overall fit for each Rotterdam score model

Model	Adult versus Pediatric	New Pediatric Final Model	New Pediatric Model, Severe TBI only	New Pediatric Model, Excluding NAT
Population characteristics	GCS 3–12	GCS 3–12	GCS 3–8	GCS 3–12 No NAT
Prediction dataset	Maas et al[14]	Prediction Cohort	Prediction Cohort	Prediction Cohort
Prediction N	2,249	442	360	385
Validation dataset	Entire PCH Cohort	Validation Cohort	Validation Cohort	Validation Cohort
Validation N	632	190	144	167
AUC (95% CI)	0.85 (0.80 – 0.89)	0.80 (0.68 – 0.91)	0.81 (0.70 – 0.92)	0.92 (0.86 – 0.97)
Cox's calibration regression
Intercept (95% CI)	1.08 (0.57 – 1.60)	−0.43 (−1.10 – 0.24)	−0.32 (−0.99 – 0.36)	−0.24 (−1.07 – 0.60)
Slope (95% CI)	1.81 (1.46 – 2.15)	0.86 (0.52 – 1.20)	0.87 (0.50 – 1.24)	1.08 (0.63 – 1.52)
LRX² (1)	165.6	31.2	28.3	43.0
p	< 0.001	< 0.001	< 0.001	< 0.001
Brier's score	0.098	0.082	0.098	0.052
Figure	3	4

GCS = Glasgow Coma Scale; NAT = Non-accidental Trauma; PCH = Primary Children's Hospital; AUC = Area under the curve; CI = confidence interval; LR = likelihood ratio test