Table 3.

B-mode ultrasound imaging and elastographic characteristics for control and patients with endometrial cancer

Variables	Control	n	Case	n	P of t-test
Strain ratio, mean (SD)	0.45 (0.15)	23	1.03 (0.67)	28	<0.001*
Endometrial thickness grey scale (mm), mean (SD)	4.51 (2.69)	28	12.1 (8.81)	28	<0.001*
ED, (mm), green scale, mean (SD)	4.25 (3.18)	28	6.25 (5.80)	26	0.118
Distance ratio, grey/green, mean (SD)	0.93 (0.29)	23	1.98 (1.70)	23	0.006*

1. When the endometrium was totally replaced by tumor, the elastographic thickness was defined as 0 in 3 cases (2 postmenopausal and 1 premenopausal). In these cases, the distance ratio of elastographic distance/gray scale thickness = 0, while the distance ratio of grey/elastographic distance is invalid, 2. There were also three cases (one premenopausal and two postmenopausal), where the distance ratio could not be obtained due to technical difficulty in measuring due to either the axial position of the uterus or the appearance of the elastographic image. SD: Standard deviation, ED: Elastography distance