Table 2.

MRI characteristics

CharacteristicTotal MSRRSPPPHealthy controls
Values are expressed as median (interquartile range).
RR = relapsing-remitting; SP = secondary progressive; PP = primary progressive; PF = parenchymal fraction: whole brain parenchyma/intracranial volume; VF = ventricular fraction: ventricle volume/whole brain parenchyma; T2LV = T2-weighted lesion volume; T1LV = T1-weighted lesion volume; NA = not applicable.
PF0.81 (0.78–0.85)0.83 (0.79–0.86)0.80 (0.77–0.83)0.79 (0.78–0.82)0.87 (0.83–0.88)
VF0.029 (0.021–0.041)0.027 (0.021–0.036)0.036 (0.027–0.043)0.032 (0.021–0.045)0.013 (0.011–0.020)
T2LV, cm38.2 (3.3–18.5)8.8 (3.1–20.9)9.2 (4.4–20.3)3.8 (1.4–9.3)NA
T1LV, cm31.3 (0.2–3.1)1.4 (0.3–3.4)1.5 (0.5–2.9)0.3 (0.03–2.2)NA