Table 3 Multilevel likelihood ratios for hsCRP and PCT to diagnose CAP without chest radiography

PCT (μg/L)

> 0.1

406 (75)

0.90

0.59

2.22

0.16

> 0.25

300 (55)

0.74

0.85

4.87

0.31

> 0.5

225 (41)

0.57

0.93

8.21

0.46

> 1.0

167 (31)

0.43

0.96

10.57

0.59

hsCRP (mg/L)

N (%)

Sensitivity

Specificity

LR +

LR -

> 40

413 (76)

0.89

0.52

1.86

0.22

> 50

384 (70)

0.87

0.65

2.44

0.21

> 100

281 (52)

0.69

0.86

4.94

0.36

> 200

141 (26)

0.36

0.96

8.83

0.67