Prevalence of infants with each item in cerebral WM score (VPT infants/term infants)
| Variables | WM Score | ||||
|---|---|---|---|---|---|
| Score 0 | Score 1 | Score 2 | Score 3 | Score 4 | |
| Cerebral WM | |||||
| Cystic lesions | None (90/22) | Focal unilateral (3/0) | Focal bilateral (1/0) | Extensive unilateral (2/0) | Extensive bilateral (1/0) |
| Focal signal abnormality | None (77/20) | Focal punctate (13/2) | Extensive punctate (5/0) | Linear (2/0) | |
| Myelination delay | PLIC & corona radiata (65/22) | Only PLIC (26/0) | Minimal—no PLIC (6/0) | ||
| Thinning of the corpus callosum | None (40/18) | Partial (genu/body < 1.3 mm or splenium < 2.0 mm) (53/4) | Global (genu/body < 1.3 mm and splenium < 2.0 mm) (4/0) | ||
| Dilated lateral ventricles | Both sides VD < 7.5 mm (26/17) | One side 7.5 mm ≤ VD < 10 mm (19/4) | Both sides 7.5 mm ≤ VD < 10 mm or one side VD ≥ 10 mm (42/1) | Both sides VD ≥ 10 mm (10/0) | |
| Volume reduction | cBPW ≥77 mm (21/19) | 77 mm > cBPW ≥72 mm (30/2) | 72 mm > cBPW ≥67 mm (40/1) | 67 mm > cBPW (6/0) | |
Note:—cBPW indicates corrected biparietal width; PLIC, posterior limb of internal capsule; VD, ventricular diameter.