Table 5 Stratified multivariable logistic regression by surgical procedure and anatomic resection to investigate the effect of different bowel preparation types on primary outcomes

Surgical procedure

Open procedure

N = 840

N = 781

N = 138

N = 1468

 SSI

ref

0.77

(0.55, 1.08)

0.131

0.49

(0.23, 0.98)

0.044

0.51

(0.37, 0.69)

 < 0.0001

 Anastomotic leak^a

ref

0.71

(0.36, 1.40)

0.316

0.52

(0.12, 2.33)

0.394

0.47

(0.25, 0.91)

0.024

Laparoscopic procedure

N = 3942

N = 626

N = 6451

 SSI

ref

0.81

(0.64, 1.02)

0.067

0.70

(0.46, 1.05)

0.084

0.58

(0.47, 0.72)

 < 0.0001

 Anastomotic leak^a

ref

0.69

(0.49, 0.97)

0.035

0.60

(0.31, 1.17)

0.133

0.49

(0.35, 0.68)

 < 0.0001

Robotic procedure

N = 559

N = 115

N = 1288

 SSI

ref

1.40

(0.66, 2.96)

0.385

0.94

(0.28, 3.15)

0.926

1.02

(0.51, 2.06)

0.955

 Anastomotic leak^a

ref

0.70

(0.24, 2.08)

0.518

0.31

(0.04, 2.71)

0.291

0.58

(0.22, 1.53)

0.274

Resection location

Left-sided resection

N = 2437

N = 4660

N = 727

N = 8277

 SSI

ref

0.87

(0.74, 1.02)

0.088

0.68

(0.51, 0.92)

0.012

0.60

(0.51, 0.70)

 < 0.0001

 Anastomotic leak^a

ref

0.68

(0.52, 0.87)

0.003

0.58

(0.35, 0.95)

0.029

0.47

(0.37, 0.60)

 < 0.0001

Right-sided resection

N = 87

N = 55

N = 12

N = 125

 SSI

ref

0.97

(0.32, 2.89)

0.949

1.25

(0.23, 6.86)

0.801

0.46

(0.18, 1.17)

0.103

 Anastomotic leak ^b

ref

–

–

–

–

–

–

–

–

–