EDN1 and type 2 diabetes mellitus: The obtained regression equation is presented below:P = 1/(1 + e−z)z = −2.8 + 2.51 × X (DM) + 2.37 × X (ET1) − 2.16 × X (group)where P is the probability of developing complications in the early postoperative period, X (DM) is type 2 diabetes in medical history (0, absence; 1, presence), X (ET1) is the concentration of endothelin-1 on the eve of surgery (pg/mL), and X (group) is the group of patients according to the approach to prehabilitation (0, controls; 1, training group).