Table 5.

Area under the receiver operating characteristic curves (AUC), sensitive and specificity of NLR in predicting the diagnosis of acute appendicitis and perforated appendicitis

Comparison	Cut-off point	AUC (95% CI)	P-value1	SN	SP	LR+	LR−	Correctly classified
Group 3 versus Group 1	≥ 5.11	0.93 (0.89,0.96)	< 0.001	83.33	91.30	9.58	0.18	87.34%
Group 2 versus Group 1	≥ 3.11	0.76 (0.69,0.82)	< 0.001	75.23	68.70	2.40	0.36	71.88%
Group 3 versus Group 2	≥ 6.17	0.70 (0.63,077)	< 0.001	76.32	58.72	1.85	0.40	67.71%

Notes: CI = confidence interval; Group 1: normal appendix; Group 2: acute appendicitis; Group 3: perforated appendicitis

¹Compare with null hypothesis AUC = 0.5