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TABLE 3: 
Highest grade of periventricular echogenicity and the grade of periventricular echogenicity shown on the last neonatal sonogram in the MR imaging-defined white matter abnormality groups
Normal (n=14) n (%)Minimal WMA (n=10) n (%)Moderate WMA (n=8) n (%)
Highest Grade Last StudyHighest Grade Last StudyHighest Grade Last Study
Grade periventricular Echogenicity
 None4 (29)13 (93)5 (50)6 (60)1 (13)7 (87)
 Grade 13 (21)1 (7)2 (20)3 (30)2 (25)0
 Grade 27 (50)02 (20)1 (10)2 (25)0
 Grade 3001 (10)02 (25)1 (13)
 Grade 500001 (13)0
Duration periventricular Echogenicity (if present)
 Transient3 (30)02 (29)
 Persistent6 (60)3 (60)5 (71)
 Uncertain1 (10)2 (40)0
  • Note.—WMA indicates white matter abnormality.