Research Paper Volume 11, Issue 19 pp 8701—8709

Time-to-event analyses of lower-limb venous thromboembolism in aged patients undergoing lumbar spine surgery: a retrospective study of 1620 patients

Figure 4. Kaplan-Meier analysis regarding hypertension. (A) Time-to-event analysis of postoperative VTE incidence related to hypertension; (B) Cumulative hazard model (log-rank test, P<0.001).