New parameter in diagnosis of acute appendicitis: Platelet distribution width

Table 2 Diagnostic comparison of blood parameters

Parameter	Cutoff	AUC	Sensitivity	Specificity	PPV	NPV	PLR	NLR	DA
		(95%CI)	(%)	(%)	(%)	(%)			(%)
White blood cell count	10.6 × 109/μL	0.87 (0.84-0.91)	73.1	94	97.1	56.0	12.1	0.3	78
Neutrophil	69.85%	0.87 (0.84-0.91)	70.0	96	97.9	54.2	23.0	0.3	76
Mean platelet volume	8.98 fL	0.62 (0.55-0.68)	29.5	49	61.1	20.1	0.5	4.5	34
Platelet distribution width	32.15%	0.95 (0.92-0.98)	97.1	93	97.4	92.1	13.8	0.0	96

AUC: Area under the receiver operating characteristic curve; DA: Diagnostic accuracy; NLR: Negative likelihood ratio; NPV: Negative predictive value; PLR: Positive likelihood ratio; PPV: Positive predictive value.