His primary areas of study are Internal medicine, Meta-analysis, Relative risk, Surgery and Confidence interval. The concepts of his Internal medicine study are interwoven with issues in Gastroenterology, Endocrinology and Oncology. Vincenzo Bagnardi has researched Meta-analysis in several fields, including Rectum, Prospective cohort study, Absolute risk reduction and Epidemiology.

His Relative risk study combines topics in areas such as Cohort study, Confounding and Risk factor. His Radiation therapy study, which is part of a larger body of work in Surgery, is frequently linked to Butyrate, bridging the gap between disciplines. His Confidence interval research is multidisciplinary, incorporating perspectives in Odds ratio, Case-control study and Cohort.