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

Table 1 Diagnostic efficiency of two ultrasonography methods

Diagnostic method	Nature	Gold standard (units)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
		Positive	Negative
Conventional abdominal ultrasonography	Positive	60	10	83.33	64.29	78.00	85.71	60.00
	Negative	12	18
Transabdominal superficial ultrasonography	Positive	70	2	97.22	92.86	96.00	97.22	92.86
	Negative	2	26
χ2	-	-	-	7.912	6.778	14.324	6.076	8.539
P value	-	-	-	0.005	0.009	< 0.001	0.014	0.003