Comparison 3. MBP+oAB vs. nBP.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 SSI	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.63 [0.33, 1.23]
3.2 Incisional SSI	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.45 [0.14, 1.45]
3.3 Organ/space SSI	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.77 [0.33, 1.78]
3.4 Anastomotic leakage	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.89 [0.33, 2.42]
3.5 Mortality	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.20 [0.01, 4.22]
3.6 Mild postoperative complications according to Clavien‐Dindo(I + II)	1	396	Risk Ratio (M‐H, Random, 95% CI)	1.15 [0.93, 1.41]
3.7 Severe postoperative complications according to Clavien‐Dindo(III + IV)	1	396	Risk Ratio (M‐H, Random, 95% CI)	1.47 [0.80, 2.69]
3.8 Incidence of postoperative ileus	1	396	Risk Ratio (M‐H, Random, 95% CI)	1.18 [0.77, 1.81]
3.9 Length of hospital stay	1	396	Mean Difference (IV, Random, 95% CI)	0.10 [‐0.80, 1.00]
3.10 Side effects of Intervention	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.94 [0.44, 2.01]
3.11 C. difficile‐related diarrhoea	1	396	Risk Ratio (M‐H, Random, 95% CI)	0.34 [0.01, 8.30]