Table 1 Associations between the type of circular stapler and patient characteristics/operative outcomes

Age (years)

Median (range)

69(42–91)

68(41–87)

0.964

69(42–91)

68(41–87)

0.847

Sex, n

Male

32

48

30

26

Female

36

71

0.443

33

37

0.591

ASA physical status, n

1, 2

54

103

50

58

3

14

16

0.218

13

5

0.073

Diabetes mellitus

Absent

58

93

53

50

Present

10

26

0.254

10

13

0.645

Steroid use

Absent

68

118

63

63

Present

0

1

> 0.999

0

0

> 0.999

Smoking

Absent

51

65

46

46

Present

17

54

0.008

17

17

> 0.999

BMI (mg/m²)

Median (range)

21.24 (14.84–40.88)

22.77 (15.26–32.19)

0.013

21.23 (14.84–40.88)

22.21 (15.26–32.19)

0.155

Tumor location, n

Above the peritoneal reflection

57

110

57

57

Below the peritoneal reflection

11

9

0.085

6

6

> 0.999

Tumor diameter (cm)

Median (range)

3.5 (0–12.0)

4.0 (0–10.0)

0.223

3.5 (0–12.0)

4.0 (0–10.0)

0.182

Pathological stage

0

2

3

2

1

I

23

36

22

19

II

20

47

19

25

III

16

22

13

10

IV

7

11

0.732

7

8

0.767

Neoadjuvant chemoradiotherapy, n

Absent

67

116

62

61

Present

1

3

> 0.999

1

2

> 0.999

Surgical approach, n

Open

3

13

3

9

Laparoscopic

39

97

39

48

Robot-assisted

26

9

< 0.001

21

6

0.002

Number of stapler cartridges for rectal transection, n

1, 2

65

117

60

62

3

3

2

0.355

3

1

0.619

Diameter of circular stapler (mm), n

25

51

46

47

25

29

17

73

< 0.001

16

38

< 0.001

Additional reinforcement, n

Absent

27

46

24

26

Present

41

73

> 0.999

39

37

0.856

Diverting ileostomy, n

Absent

58

110

56

58

Present

10

9

0.136

7

5

0.763

Intraoperative blood loss (ml)

Median (range)

20 (5-1080)

20 (5-2730)

0.597

20 (5-1080)

20 (5-2730)

0.25

Operation time (min)

Median (range)

238 (117–1129)

247 (127–666)

0.882

228 (117–1129)

245 (130–666)

0.408