Table 2.

Plasma calprotectin sensitivity, specificity, cutoff and AUC values obtained in the different group comparisons (healthy controls vs negative RT-PCR patients; healthy controls vs positive RT-PCR patients; negative RT-PCR patients vs positive RT-PCR patients)

	Negative controls vs negative RT-PCR patients	Negative controls vs positive RT-PCR patients	Negative RT-PCR patients vs positive RT-PCR patients
Sensitivity	83.05%	92.31%	70.77%
Specificity	80.28%	94.37%	69.49%
Cutoff	> 76.45 ng/ml	> 93.04 ng/ml	> 131.3 ng/ml
Area under ROC curve (AUC); 95% confidence interval	0.8872; 0.8328–0.9416	0.9684; 0.9443–0.9924	0.7257; 0.6358–0.8156

All the calprotectin concentration values must be multiplied for a k factor of 0.023 to obtain µg/ml