Table 2 Clinical characteristics of patients in training and testing cohorts (n = 200)

Male (%)

67(94.4)

70(94.6)

1

25 (83.3)

24 (96.0)

0.29

Age (years)

37(19–65)

34(18–61)

0.52

36(25–61)

36(19–49)

0.53

BMI (Kg/m²)

23.7

(18.5–35.9)

23.4

(16.9–32.1)

0.10

23.6

(17.9–30.9)

25.5

(18.9–34.6)

0.07

Smoking history (%)

30(42.3)

41(55.4)

0.16

10 (33.3)

11 (44.0)

0.59

Alcohol intake history (%)

6(8.5)

14(18.9)

0.11

2(6.7)

6 (24.0)

0.15

Previous anal surgery (%)

49(69.0)

44(59.5)

0.30

21 (70.0)

20 (80.0)

0.59

Fistula Classification (%)

0.34

0.54

 Intersphincteric

20(28.2)

15 (20.3)

3 (10.0)

4 (16.0)

 Transsphincteric

42 (59.2)

42 (56.8)

20 (66.7)

13 (52.0)

 Suprasphincteric

8 (11.3)

16 (21.6)

7 (23.3)

8 (32.0)

 Extrasphincteric

1(1.4)

1 (1.4)

0(0)

0(0)

Horseshoe fistula (%)

37 (52.1)

41 (55.4)

0.82

18 (60.0)

13 (52.0)

0.75

Recurrent fistula (%)

29 (40.8)

21 (28.4)

0.16

9 (30.0)

12 (48.0)

0.28

Postoperative CNR value

36.6

(6.3-156.3)

93.6

(13.9-384.1)

< 0.01

39.6

(2.1-119.5)

103.6

(55.2-514.1)

< 0.01

Postoperative ADC value (10^− 3mm²/s)

1.4

(0.2–2.1)

1.3

(0.8-2.0)

0.02

1.3

(1.0-1.6)

1.2

(0.9–1.7)

0.17