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自 Meta 分析筛选结果。在模型构建变量筛选方法 究显示轻型 TBI 的癫痫发生率是普通人群的 2 倍,
上,本研究创新性地采用Meta分析结合临床因素的 而重型 TBI 则高达 7 倍 [32] 。TBI 的严重程度可通过
筛选标准,来确定纳入 Logistic 回归模型的变量,而 GCS来衡量。国内学者通过回顾性分析发现GCS评
非传统的逐步回归、LASSO、弹性网络等经典方法。 分(OR=29.081,95%CI:3.125~270.614,P=0.003)和
PTE 发生风险与损伤严重程度密切相关,前述 血清乳酸是儿童重型颅脑损伤预后的独立危险因
Meta 分析证实,儿童严重 TBI 显著增加 PTE 风险 素 。虽然在本研究GCS评分的合并效应量没有统
[33]
(OR=1.81,95% CI =1.23~2.67,P <0.001) ,另有研 计学意义(OR=1.466,95%CI:0.977~2.199,P=0.065),
[31]
A B
1.0 1.0
0.162(0.612,0.932)
0.8 0.8
0.283(0.845,0.714)
Sensitivity 0.4 Sensitivity 0.4
0.6
0.6
AUC:0.800 AUC:0.830
0.2 0.2
0 0
1.0 0.8 0.6 0.4 0.2 0 1.0 0.8 0.6 0.4 0.2 0
Specificity Specificity
A:ROC curve of the prediction model in the traning cohort. B:ROC curve of the prediction model in the internal validation cohort.
图3 风险预测模型预测TBI儿童发生PTE的ROC曲线
Figure 3 ROC curve of the prognostic model for PTE in children with TBI
A B
Training 0.8 Test
0.8
Net benefit 0.4 None Net Benefit 0.4 None
All
All
0 0
.0 0.2 0.4 0.6 0.8 1.0 .0 0.2 0.4 0.6 0.8 1.0
High risk threshold High risk threshold
A:DCA of the prediction model in the training cohort. B:DCA of the prediction model in the validation cohort. All:scenario where all samples are
considered positive(intervention for all),with net benefit represented by a negative⁃slope line;None:scenario where no samples were intervened(inter⁃
vention for none),yielding a net benefit of 0.
图4 风险预测模型预测TBI儿童发生PTE的DCA曲线
Figure 4 DCA curves of the prognostic model for forecasting PTE in children with TBI
A 0.8 Hosmer⁃Lemeshow P=0.079 B 0.8 Hosmer⁃Lemeshow P=0.082
Observed probability 0.4 Ideal Observed probability 0.4 Ideal
Bias⁃corrected
Bias⁃corrected
0
0.8
0 0.2 0.4 0.6 Apparent 1.0 0 0 0.2 0.4 0.6 Apparent 1.0
0.8
Predicted probability Predicted probability
B=500 repetitions,boot Mean absolute error=0.054(n=183) B=500 repetitions,boot Mean absolute error=0.042(n=79)
A:Calibration curve of the prediction model in the training cohort. B:Calibration curve of the prediction model in the internal validation cohort. Ap⁃
parent:apparent calibration(unadjusted);Bias⁃corrected:bias⁃corrected calibration after adjustment;Ideal:reference line of perfect calibration.
图5 风险预测模型预测TBI儿童发生PTE的校准曲线
Figure 5 Calibration curve analysis of the prognostic model for forecasting PTE probability in TBI children

