图4. 预测模型的DCA分析 横坐标为阈概率，纵坐标代表实际净收益。“无”线表示所有极早产儿均不采取措施，其净收益为0，“全部”线表示所有极早产儿均采取措施得到的净收益，“预测模型”线表示列线图模型预测极早产儿发生住院期间死亡风险的净收益。.
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