Table 2.

Predictive values of the procalcitonin serum level and the leukocyte antisedimentation rate assessment at T2 for the four cutoff values that separate the five quintiles of parameter distribution

Cutoff value	Cases below the cutoff value (n)	Sensitivity (%)	Specificity (%)	Positive predictive value (%)	Negative predictive value (%)	Positive likelihood ratio	Negative likelihood ratio
Procalcitonin (ng/ml)
0.69	7	27	9	62	14	0.3	8.1
1.23	13	68	55	75	46	1.5	0.6
2.43	20	52	83	85	50	3.1	0.6
4.43	26	30	100	100	38	>20	0.7
Leukocyte antisedimentation rate (%)
6.3	7	88	31	58	71	1.7	0.2
10.6	13	76	56	65	69	1.5	0.6
12.7	20	71	94	92	75	6.1	0.5
23.2	26	41	100	100	62	>20	0.7