Noninvasive prediction of Ki-67 expression in pancreatic cancer via contrast-enhanced ultrasound quantitative parameters: A diagnostic model study

Table 1 Baseline data of the two groups of patients, mean ± SD/n (%)

Characteristics	Ki-67 < 50%	Ki-67 ≥ 50%	P value
Age, year	59.93 ± 10.83	61.48 ± 7.90	0.642
Gender			0.816
Male	16 (29.6)	13 (24.1)
Female	13 (24.1)	12 (22.2)
CA19-9			0.746
Normal	8 (14.81)	6 (11.11)
Elevated	21 (38.89)	19 (35.19)
Diameter, cm	3.87 ± 1.39	4.84 ± 1.68	0.022a
Location			0.259
Head	14 (25.93)	8 (14.81)
Neck	4 (7.41)	5 (9.26)
Body	5 (9.26)	9 (16.67)
Tail	6 (11.11)	3 (5.56)
Differentiation grade			0.301
Well	11 (20.37)	5 (9.26)
Moderately	7 (12.96)	6 (11.11)
Poorly	11 (20.37)	14 (25.92)
TNM stage			0.140
I	6	1
II	3	2
III	15	13
IV	4	9

^aP < 0.05.

CA: Carbohydrate antigen; TNM: Tumor node metastasis.