Table 1: Score for the assessment of ultrasound scans at time 0 and time 1 (after 15 days).

Ultrasound scan assessment
Score: 0-6 points
Periventricular echodensity PVL (0-3 points) Absent 0 points
Mild 1 point
Moderate 2 points
De Vriesí score for PVL (0-3 points) No PVL 0 points
Grade 1 1 point
Grade 2 2 points
Grade 3 3 points