1. A and B, The ROC curves analyzing the sensitivity and specificity of the WHO grading system (I-IV) for the 1-year survival (A) and recurrence (B) show the optimal threshold value as <2 (WHO grade II) (sensitivity, 81.2% [95% confidence interval (CI), 54.3–9...
A and B, The ROC curves analyzing the sensitivity and specificity of the WHO grading system (I-IV) for the 1-year survival (A) and recurrence (B) show the optimal threshold value as <2 (WHO grade II) (sensitivity, 81.2% [95% confidence interval (CI), 54.3–95.7%]; specificity, 90.9% [95% CI, 58.7–98.5%], P = .0002) for 1-year survival and as >2 (sensitivity, 88.9% [95% CI, 51.7–98.2%]; specificity, 72.2% [95% CI, 46.5–90.2%], P = .0001) for recurrence. C, Kaplan-Meier curve of PFS probability is based on stratification according to the WHO grade (1 = low grade [WHO I-II], 2 = high grade [WHO III and IV)]; HR = 0.15, P = .05).
S. Bisdas et al. AJNR Am J Neuroradiol 2009;30:
©2009 by American Society of Neuroradiology