Table 4.

Measures of discrimination, calibration, and overall fit for mortality prediction models in children with moderate or severe TBI

Model components	Rotterdam alone – Final model	GCS alone	Rotterdam and GCS	Rotterdam, GCS, mechanism, ISS
Prediction dataset	Prediction Cohort	Prediction Cohort	Prediction Cohort	Prediction Cohort
Prediction N	442	442	442	442
Validation dataset	Validation Cohort	Validation Cohort	Validation Cohort	Validation Cohort
Validation N	190	190	190	190
AUC (95% CI)	0.80 (0.68 – 0.91)	0.70 (0.62 – 0.78)	0.83 (0.72 – 0.94)	0.91 (0.84 – 0.98)
Cox's calibration regression
Intercept (95% CI)	−0.43 (−1.10 – 0.24)	−0.12 (−1.27 – 1.03)	−0.31 (−0.98 – 0.36)	0.20 (−0.55 – 0.94)
Slope (95% CI)	0.86 (0.52 – 1.20)	1.13 (0.36 – 1.91)	0.89 (0.56 – 1.23)	1.13 (0.72 – 1.53)
LRX2 (1)	31.2	15.2	37.0	59.6
p	< 0.001	< 0.001	< 0.001	< 0.001
Brier's score	0.082	0.101	0.078	0.060
Figure	2

TBI = traumatic brain injury; GCS = Glasgow Coma Scale; ISS = Injury Severity Score; AUC = Area under the curve; CI = confidence interval; LR = likelihood ratio test