Diagnostic efficacy, imaging characteristics, and detection accuracy of transabdominal superficial ultrasonography for various types of appendicitis

Table 3 Comparison of diagnostic efficacy of two ultrasonography methods for acute suppurative appendicitis

Diagnostic method	Nature	Gold standard (units)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
		Positive	Negative
Conventional abdominal ultrasonography	Positive	16	12	61.54	73.91	69.44	57.14	77.27
	Negative	10	34
Transabdominal superficial ultrasonography	Positive	24	3	92.31	93.48	93.06	88.89	95.56
	Negative	2	43
χ2	-	-	-	6.933	6.452	13.174	6.984	6.375
P value	-	-	-	0.008	0.011	< 0.001	0.008	0.012