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

Table 2 Comparison of diagnostic efficacy of two ultrasonography methods for detecting acute simple appendicitis

Diagnostic method	Nature	Gold standard (units)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
		Positive	Negative
Conventional abdominal ultrasonography	Positive	13	11	59.09	78.00	72.22	54.17	81.25
	Negative	9	39
Transabdominal superficial ultrasonography	Positive	20	3	90.91	94.00	93.06	86.96	95.92
	Negative	2	47
χ2	-	-	-	5.939	5.316	10.891	6.038	5.189
P value	-	-	-	0.015	0.021	0.001	0.014	0.023

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

Table 4 Comparison of diagnostic efficacy of two ultrasonography methods for acute gangrenous appendicitis

Diagnostic method	Nature	Gold standard (units)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
		Positive	Negative
Conventional abdominal ultrasonography	Positive	15	8	62.50	83.33	76.39	65.22	81.63
	Negative	9	40
Transabdominal superficial ultrasonography	Positive	23	1	95.83	97.92	97.22	85.83	97.92
	Negative	1	47
χ2	-	-	-	8.084	6.008	13.642	7.111	6.954
P value	-	-	-	0.004	0.014	< 0.001	0.008	0.008