Multi-slice spiral computed tomography in differential diagnosis of gastric stromal tumors and benign gastric polyps, and gastric stromal tumor risk stratification assessment

Table 7 Comparison of computed tomography values of patients in gastric stromal tumor groups with different risk classes (mean ± SD)

Group	n	Arterial phase	Venous phase	Delay period	Reinforcement peak
Low-intermediate-risk group	41	55.71 ± 13.77	57.94 ± 12.51	64.83 ± 11.20	72.66 ± 12.46
High-risk group	23	78.72 ± 12.66	61.00 ± 11.96	69.70 ± 10.85	80.79 ± 12.37
t value		-6.598	-0.954	-1.688	-2.511
P value		0.000	0.344	0.097	0.015