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Table 1: Comparison of GM-IVH groups for study variables^{^a}
GM-IVH Grade I II III IV P
Brain stem SS (%) 45.5 95.5 95.5 95.5 <.001
Brain stem SS distribution 0 (140.6) 168.8 (140.6) 213.8 (106.9) 247.5 (163.1) <.001
Spinal cord SSD (mm) 0 (0–0.8) 0.65 (0–1.1) 0.8 (0–1.5) 0.75 (0–1.5) <.001
Medulla oblongata SSD (mm) 0 (0–0.8) 0.75 (0–1.2) 1 (0–1.7) 1 (0–2) <.001
Pons SSD (mm) 0 (0–1.2) 0.6 (0–1.1) 0.8 (0–1.7) 0.85 (0–1.8) <.001
Mesencephalon SSD (mm) 0 (0–0.9) 0.6 (0–1.1) 0.8 (0–1.6) 0.8 (0–2.3) <.001
Lateral ventricle SSD (mm) 0.5 (0–1) 0.9 (0–3.3) 1 (0–2) 0.95 (0.4–2.5) <.001
Third ventricle SSD (mm) 0 (0–0.2) 0 (0–1.6) 0 (0–2.2) 0.6 (0–1.2) <.001
Fourth ventricle SSD (mm) 0 (0–0.8) 0.1 (0–0.9) 0.4 (0–1.9) 0.65 (0–2.2) <.001
CN VII/VIII siderosis (%) 9.1 54.5 72.7 54.5 <.001
Total ventricular HV on HUS (mm³) 64.9 (79.8) 491.1 (358.7) 2168.7 (2469) 4319.4 (9731.5) <.001
Total cerebellar HV (mm³) 0 (0–13.6) 0 (0–6333) 0 (0–530) 0.5 (0–1123) .12
Cerebellar SS present (%) 31.8 77.3 72.7 59.1 .009
Cerebellar SS depth (mm) 0 (0–0.25) 0.3 (0–2) 0.35 (0–2.1) 0.43 (0–2.2) .001
Cerebellar hematoma present (%) 27.3 45.5 27.3 50 .26
Note:—HV indicates hematoma volume; SSD, superficial siderosis depth.
↵a Numeric variables are presented as median (minimum-maximum).