Table 2.

Sensitivity, specificity, and positive and negative predictive values of each test.

Test	Sensitivity (95% CI)	Specificity (95% CI)	Positive predictive value (PPV) (95% CI)	Negative predictive value (NPV) (95% CI)
WBC	22.9% (11.04–40.55)	85.7% (42.01–99.25)	88.9% (50.67–99.42)	18.2% (7.62–36.08)
CRP	60.0% (42.21–75.65)	85.7% (42.01–99.25)	95.5% (75.12–99.76)	30.0% (12.84–54.33)
IL-6	57.1% (39.52–73.24)	57.1% (20.24–88.19)	87.0% (65.33–96.57)	21.1% (6.97–46.10)
ESR	37.1% (21.99–55.05)	71.4% (30.26–94.89)	86.7% (58.39–97.66)	18.5% (7.03–38.75)

95% CI: 95% confidence interval.