Comparison of different surgery operation techniques

This study proceeds from the database of two patient groups. Patients in first group underwent intraabdominal anastomotic operation technique and they come from a selected hospital in USA. Patients in second group underwent extraabdominal anastomotic operation technique and they come from the Clinic of Surgery at the University Hospital Ostrava (Czech Republic). Both groups have more than 200 patients. Both operation techniques are compared in the study taking into account the following variables: risk of post-operative morbidity, conversion, operation time, BMI, ASA, etc. Risk of morbidity will be quantified, compared for different patient groups and deeply discussed in the paper, by the use of advanced statistical methods, as logistic regression, Agresti-Coull and Wilson interval, hypotheses testing, etc. To be comparable both data groups had to be adapted and modified at the earliest by the use of a proper method based on propensity score.