Table 4.

ROC analysis of MDCT and laboratory findings

	AUC (%)	P	Cut-off	Sensitivity (%)	Specificity (%)	PPD (%)	NPD (%)
Long axis (mm)	85.10	<0.001	13.15	76.52	80.80	51.76	92.74
Short axis (mm)	58.60	0.004	9.35	73.04	46.60	26.92	86.52
Appendix Sphericity index (ASI)	93.90	<0.001	1.30	80.87	93.21	76.23	94.76
Appendicolith		0.001		37.39	77.99	31.39	82.22
Free fluid		<0.001		64.35	76.58	42.53	88.86
Wall defect		<0.001		36.52	94.61	64.62	84.70
Abscess		<0.001		14.78	98.59	73.91	81.12
Extraluminal air		<0.001		5.22	100.00	100.00	79.66
Ileus		0.273		7.83	94.85	29.03	79.26
RPS		<0.001		45.22	86.89	48.15	85.48
WBC (103/mm3)	51.50	0.613
CRP (mg/dL)	58.20	0.008	1.96	67.26	25.85	47.09	83.98

ROC analysis: Receiver operating characteristic; MDCT: Multidetector computed tomography; RPS: Retroperitoneal space; WBC: White blood count; CRP: C-reactive protein