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. 2023 Dec 13;102(1):e207768. doi: 10.1212/WNL.0000000000207768

Figure 4. Survival Curves for Time to PIRA for Baseline Spinal Cord C2-C3 Cross sectional Area (A), Baseline Brain Parenchymal Fraction (B), Baseline Thalamic Fraction (C), and Baseline Cortical Fraction (D).

Figure 4

The curves display the longitudinal evolution in patients having baseline MRI measurements either higher (“upper half”) or lower (“lower half”) than the population average. Reported hazard ratio refers to the multivariable Cox regression models using baseline MRI measurements as continuous variables. BPF = brain parenchymal fraction; CSA = cross-sectional area; HR = hazard ratio; PIRA = progression independent of relapse activity.