Accuracy of dual-contrast gastrointestinal ultrasonography in predicting lymph node metastasis in older adults with gastric cancer

Table 1 General data (mean ± SD), n (%)

Data class	Lymph node metastasis (n = 35)	No metastasis (n = 65)	t/χ2	P value
Sex
Male	18 (51.43)	35 (53.85)	0.053	0.817
Female	17 (48.57)	30 (46.15)
Age (years)	56.24 ± 5.71	55.38 ± 5.43	0.742	0.461
Body mass index (kg/m2)	24.17 ± 1.15	24.09 ± 1.03	0.356	0.723
Duration of disease (years)	2.31 ± 0.46	2.24 ± 0.51	0.677	0.501
Tumor diameter (mm)	4.08 ± 0.75	3.97 ± 0.72	0.718	0.475
TNM staging
Phase I	25 (71.43)	61 (93.85)	9.496	0.002
Phase II	10 (28.57)	4 (6.15)

Table 2 Gastrointestinal dual-contrast ultrasonography examination indicators

Group	n	ET (s)	TTP (s)	WIR
Lymph node metastasis	35	15.45 ± 4.37	8.16 ± 2.32	7.36 ± 1.97
No metastasis	65	22.08 ± 6.74	11.87 ± 4.28	6.17 ± 1.25
t	-	5.249	4.758	3.689
P value	-	< 0.001	< 0.001	< 0.001

ET: Enhancement time; TTP: Time to peak; WIR: Wash-in rate.

Table 3 Efficacy analysis of gastrointestinal dual-contrast ultrasonography examination enhancement time, time to peak, wash-in rate, and combined diagnosis for gastric cancer lymph node metastasis

Index	Sensitivity	Specificity	Youden index	AUC value	95%CI	Cut-off value
ET	0.615	0.807	0.421	0.792	0.708-0.891	16.32
TTP	0.930	0.569	0.495	0.776	0.684-0.867	10.67
WIR	0.725	0.961	0.676	0.751	0.604-0.904	7.02
Combined diagnosis	0.782	0.748	0.535	0.836	0.769-0.932	-

ET: Enhancement time; TTP: Time to peak; WIR: Wash-in rate; AUC: Area under the curve.