“…We have previously found [24] the causes of unsatisfactory results of decompressive-stabilizing interventions at the lumbar level: female gender, age of 65 and older, body mass index of 25 or greater, ASA III and above, smoking status, blood loss exceeding 500 ml, comorbid pathology, general anesthesia longer than 180 min, a type of the surgical method. Based on the results of the mixed-effects logistic regression model, numeric values (points) were determined for each parameter and threshold values for the risk of unsatisfactory postoperative outcome: low risk up to 5 points, moderate risk from 6 to 8 points, high risk over 8 points.…”