Fig. 9
Statistical characteristics of the Karnofsky Performance Status Scale values and the patient survival rate after surgery. a Karnofsky Performance Scores in the study group before and after surgery (n = 140). (White square—the thick line segment is median; white circle—outliers; asterisk—extremes). b Histogram reflecting the distribution of the Karnofsky index change indicator among the patients (ΔK = Kafter surgery − Kbefore surgery), where K = Karnofsky index. c Patient survival rate (Kaplan-Meier). The 3-year survival rate of patients with chordomas was 98.3%, while the 5-year survival rate amounted to 92.3%. The 3- and 5-year survival rate in the group with pituitary adenomas was 87%. The 3-year survival rate of patients with meningiomas and other tumors was identical and amounted to 100%. In this study, the confidence interval was 95%, and the statistical significance threshold was p < 0.05