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Receiver-operator characteristic analysis. Receiver-operator characteristic analysis was performed to determine the threshold value of hemoglobin (A), total protein (B), lactate dehydrogenase (C), and blood urea nitrogen (D) that could differentiate between upper and lower gastrointestinal bleeding. Solid straight line: a line with a slope of 45° used to calculate the threshold by JMP10.0.2 software, dashed line: reference line.
