Table 3.

Diagnostic value of each inflammatory parameter for abscess and/or perforation (groups A+B vs. group C)

	PCT	BT	WBC	N/L ratio	CRP
Optimal cutoff value	0.46 (ng/mL)	37.6 (°C)	16.7 (×103/μL)	7.3	6.7 (mg/dL)
Positive predictive value	73	47	36	38	48
Negative predictive value	92	86	80	85	92
Area under the ROC curve	0.832	0.733	0.439	0.609	0.830