改变疑似阑尾炎病人白细胞计数的截点的效果

白细胞计数截点*

敏感性

特异性

LR+

LR-

> 10,500

84%

53.13%

1.79

0.3

> 11,500

78%

62.5%

2.13

0.32

> 12,850

68%

75%

2.72

0.43

> 13,400

61.33%

78.12%

2.86

0.45

> 14,300

56.67%

81.25%

3.2

0.49

*像白细胞计数等连续型变量的检查结果可以选择不同截点;高于截点的检测结果为阳性,低于截点的检测结果为阴性。列出的数值是每微升血液的数值。

LR = 似然比; WBC = 白细胞。

Adapted from Keskek M, Tez M, Yoldas O, et al: Receiver operating characteristic analysis of leukocyte counts in operations for suspected appendicitis.American Journal of Emergency Medicine 26:769–772, 2008.