Table 1 The distribution of baseline characteristics based on testing sets

Testing set 1

Variables

Total

(n = 70)

Benign

(n = 44)

Malignant

(n = 26)

p

Age, Mean ± SD

43.29 ± 12.9

38.89 ± 11.42

50.73 ± 11.99

< 0.01

Height, Mean ± SD

159.17 ± 3.86

159.57 ± 3.86

158.5 ± 3.85

0.27

Weight, Mean ± SD

57.49 ± 6.97

56.27 ± 6.42

59.54 ± 7.5

0.07

BI-RADS, n (%)

< 0.001

2

14 (20)

14 (32)

0 (0)

3

14 (20)

14 (32)

0 (0)

4 A

11 (16)

9 (20)

2 (8)

4B

14 (20)

7 (16)

7 (27)

4 C

8 (11)

0 (0)

8 (31)

5

9 (13)

0 (0)

9 (35)

Max. size, Median (Q1, Q3)

8 (6, 14)

7 (5.75, 11)

12.5 (8, 15)

0.001

Testing set 2

Variables

Total

(n = 97)

Benign

(n = 58)

Malignant

(n = 39)

p

Age, Median (Q1, Q3)

40 (31, 50)

36 (28.5, 41)

49 (43, 58.5)

< 0.01

Height, Median (Q1, Q3)

158 (155, 162)

159 (156, 2.75)

158 (155, 162)

0.87

Weight, Median (Q1, Q3)

57 (52, 62)

55.5 (51, 60)

60 (56.5, 64.5)

< 0.01

BI-RADS, n (%)

< 0.01

2

20 (21)

20 (34)

0 (0)

3

19 (20)

19 (33)

0 (0)

4 A

14 (14)

13 (22)

1 (3)

4B

15 (15)

6 (10)

9 (23)

4 C

15 (15)

0 (0)

15 (38)

5

14 (14)

0 (0)

14 (36)

Max. size, Median (Q1, Q3)

13 (9, 23)

11.5 (7, 18.75)

17 (12.5, 24)

< 0.01