Table 2 MRI features and clinical characteristics of patients with rectal cancer(n=158)

Age

60.66±13.38

60.42±12.89

61.07±14.26

0.388

Gender

0.769

 Male

106

66(67.35%)

40(66.67%)

 Female

52

32(32.65%)

20(33.33%)

ADC (×10^-3mm²/ms )

1.22±0.39

1.37±0.37

1.15±0.38

0.008^*

 Mean

66.47±14.55

62.66±10.53

73.34±18.38

<0.0001

 Variance

289.19±118.96

267.65±122.51

334.39±94.27

<0.0001

 Skewness

0.54±0.67

0.43±0.53

0.73±0.42

<0.0001

 Entropy

1.89±0.23

1.80±0.19

1.97±0.14

<0.0001

 RLUN

178.38±65.19

159.87±53.38

208.12±69.14

<0.0001

 GLUN

7.53±3.44

6.55±2.83

9.26±3.33

<0.0001

 Upper Rectum

48

33(33.67%)

15(25.00%)

0.095

 Middle Rectum

72

47(47.96%)

25(41.67%)

 Lower Rectum

38

18(18.37%)

20(33.33%)

Tumor shape

0.022

 Intraluminal polypoid mass

40

31(31.63%)

9(15.00%)

 Ulcerofungating/Ulceroinfiltrative mass

95

57(58.16%)

38(63.33%)

 Bulky

23

10(10.20%)

13(21.67%)

 Tumor length(cm)

4.12±1.68

4.04±1.62

4.25±1.78

0.446^*

Tumor type

0.556

 Mucinous adenocarcinoma

23

13(13.27%)

10(16.67%)

 Non-mucinous adenocarcinoma

135

85(86.73%)

50(83.33%)

Cirumferential extent

0.872^**

 C1

6

4(4.08%)

2(3.33%)

 C2

56

36(36.73%)

20(33.33%)

 C3

56

34(34.69%)

22(36.67%)

 C4

40

24(24.49%)

16(26.67%)

Radiologic T stage

0.029

 T1-2

49

35(35.71%)

14(23.33%)

 T3

94

58(59.18%)

36(60.00%)

 T4

15

5(5.10%)

10(16.67%)

T3 substage

0.041

 T3a

23

19(32.76%)

4(11.11%)

 T3b

36

23(39.66%)

13(36.11%)

 T3c

23

11(18.97%)

12(33.33%)

 T3d

12

5(8.62%)

7(19.44%)

MEMD(cm)

0.30±0.60

0.30±0.60

0.50±0.60

0.028^*

N stage

0.754

 N0

74

48(48.98%)

26(43.33%)

 N1

51

31(31.63%)

20(33.33%)

 N2

23

19(19.39%)

14(23.33%)

EMVI

0.664

 Positive

34

20(20.41%)

14(23.33%)

 Negative

124

78(79.59%)

46(76.67%)

CRM

0.337

 Positive

38

28(28.57%)

13(21.67%)

 Negative

120

70(71.43%)

47(78.33%)