Relationship between multi-slice computed tomography features and pathological risk stratification assessment in gastric gastrointestinal stromal tumors

Table 1 Quantitative features between low-grade and high-grade group

Variables	Low-grade group	High-grade group	χ2/Z/t value	P value
	n = 101, 68.7%	n = 46, 31.3%
Age (mean ± SD, yr)	60.59 ± 10.33	62.09 ± 11.19	-0.791	0.43
Sex (n, %)
Male	47 (46.5)	26 (56.5)	1.261	0.261
Female	53 (53.5)	20 (43.5)
Tumor size (mean ± SD), cm	3.14 ± 0.94	6.63 ± 3.26	-9.918	< 0.001
Unenhanced CT, Hu	34.26 ± 3.86	33.93 ± 4.80	0.434	0.665
Absolute enhancement
AP, Hu	49.72 ± 8.63	47.15 ± 9.44	1.625	0.106
PVP, Hu	60.83 ± 11.07	59.11 ± 11.79	0.858	0.393
DP, Hu	64.68 ± 9.06	63.09 ± 9.12	0.988	0.325
Relative enhancement
AP, Hu	15.47 ± 7.57	13.22 ± 9.40	1.544	0.125
PVP, Hu	26.57 ± 10.11	25.17 ± 11.69	0.745	0.457
DP, Hu	30.43 ± 7.66	29.15 ± 9.03	0.883	0.379

CT: Computed tomography; AP: Arterial phase; DP: Delayed phase; PVP: Portal venous phase.