Prediction of Solitary Plasmacytoma of Bone in Elderly Patients: A Nomogram and a Risk Classification System for Overall Survival

Figure 2

Identification of optimal cut-off values of age and risk scores by X-tile analysis. Optimal cut-off values of age were identified as 71 and 82 years based on overall survival (a). Optimal cut-off values of risk scores were identified as 96 scores based on overall survival (c). Histogram and Kaplan–Meier analyses were developed based on these cut-off values (b, d).

(a)

(b)

(c)

(d)