Predefined data were extracted from the selected articles into a structured proforma by two independent authors, (DT and HTM). Data extracted from each paper included the general information of the study (author’s name, article title, publication year, geographical region of the study, study design and indication for surgery), characteristics of the participants with and without diabetes, and statistical results of postoperative complications. For quality assessment of the included studies, the Newcastle–Ottawa Quality Assessment Form for Cohort Studies [18] and Jadad Scale [19] were utilized. The Newcastle–Ottawa Quality Assessment Form for Cohort Studies [18] is designed to assess the quality of nonrandomised studies in meta-analyses and evaluates studies on three domains: the selection of the study groups; the comparability of the groups; and the outcome of interest for cohort studies. The Jadad scale [19] for RCTs is created to assess the methodological quality of a clinical trial, by assessing the effectiveness of blinding.

Note: The content above has been extracted from a research article, so it may not display correctly.

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