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

From: Diagnostic and prognostic accuracy of clinical and laboratory parameters in community-acquired pneumonia

  N (%) Sensitivity Specificity LR + LR -
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