The forest plot shows the relationship between diabetes and colorectal resection SSIs. The red squares represent each study’s odds ratio (OR), with the size reflecting its meta-analysis weight. The 95% odds ratio CIs are horizontal lines next to the red squares. The diamond at the bottom of the plot shows the pooled odds ratio (OR) and 95% CI, which summarizes the combined effect of all studies. The study found a substantial correlation between diabetes mellitus and SSIs following colorectal resection, with an OR of 1.27 (95% CI: 1.16–1.39) and an I² value of 6% [33,35,38,41,43,44,45,47,49,55].