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Table 4 Diagnostic indices of C-reactive protein, white blood cell count, and the neutrophil–lymphocyte ratio in study subjects. CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value

From: Neutrophil–lymphocyte ratio for the prediction of histological chorioamnionitis in cases of preterm premature rupture of membranes: a case-control study

Blood inflammatory markers

Cut-off value

Sensitivity %

(95 % CI)

Specificity %

(95 % CI)

PPV % (95 % CI)

NPV % (95 % CI)

C-reactive protein

8.5

84 (74–91)

77 (63–87)

74 (60–85)

86 (76–92)

White blood cells

12.62 × 109

75 (65–84)

75 (61–86)

65 (65–77)

83 (73–91)

Neutrophil–lymphocyte ratio

5.97

77 (63–97)

95 (88–99)

91 (78–97)

87 (79–93)