Figure 1. Five-year cumulative recurrence risk as estimated from the Cox regression model in women (left) and men (right) at various hematocrits, adjusted for location of first venous thromboembolism, body mass index, age, factor V Leiden, and smoking status.

The gray-shaded area corresponds to the 95% confidence intervals. The histograms at the bottom show the frequency distribution (n = number of patients) of hematocrit in women and men.