Table 1.

Frequency of the main clinical characteristics of inv dup(15) or idic(15) syndrome

Exceeding 75%	From 25% to 50%	Below 25%
Hypotonia, lax ligaments	Brain abnormalities	Congenital heart defects
Developmental delay/Intellectual disability	Genitourinary tract defects	Microcephaly
Autistic behavior	Growth retardation
Epilepsy
Minor dysmorphic features (mainly involving the face)