DIV group (n = 56)

ORS group (n = 51)

P-value

Screening papillary region

3

5.4

4

7.8

0.707

ERP

11

19.6

10

19.6

>0.999

Balloon-ERP

5

8.9

1

2.0

0.209

Pancreatic juice cytology

2

3.6

2

3.9

>0.999

ERC

3

5.4

5

9.8

0.474

EST

8

14.3

6

11.8

0.779

Lithotripsy

14

25.0

15

29.4

0.667

EBS

7

12.5

8

15.7

0.782

ENBD

0

0.0

0

0.0

-

Papillectomy

1

1.8

0

0.0

>0.999

Minor papilla sphincterotomy

2

3.6

0

0.0

0.496