Table 1 Characteristics of patients/lesions before propensity-score matching

Patients

 Age, mean ± SD (range), years

69.8 ± 10.7 (42–89)

69.7 ± 11.3 (39–88)

0.962

 Sex, male/female

64/33

74/48

0.418

 Antithrombotic agents, n (%)

25 (26%)

18 (15%)

0.041

Lesions

 Location (colon/rectum)

85/12

84/38

0.001

 Morphology (0–I/0–IIa)

21/76

14/108

0.041

 Histology (adenoma/M/SM1/SM2 or more/other)

32/48/8/8/1

28/67/10/9/8

0.388

 Specimen size, mean ± SD (range), mm

40.1 ± 12.1 (18–92)

47.7 ± 16.1 (25–101)

 < 0.001

 Tumor size, mean ± SD (range), mm

26.8 ± 11.3 (10–87)

34.8 ± 16.6 (10–92)

 < 0.001

 Simultaneous removal of other polyps*, n (%)

3 (3%)

5 (4%)

1.000

ESD outcomes

 Procedure time of ESD, mean ± SD (range), min

61.0 ± 29.0 (12–171)

85.3 ± 48.7 (11–274)

 < 0.001

 En bloc resection rate  (%)

100

98

1.000

 Perforation during ESD, n (%)

3 (3%)

1 (1%)

0.324

Outcomes of prophylactic clip closure

 Procedure time, mean ± SD (range), min

 Number of clips, mean ± SD (range)

12.4 ± 5.2 (4.0–25.0)

9.8 ± 3.2 (3–21)

–

–