Table 1.

Physical and Medical Features Associated with Trisomy X

Feature	Estimated frequency based on current available data [10,19,22,33,44]
Tall stature >75th percentile	80-89%
Epicanthal folds	32-46%
Clinodactyly	42-65%
Hypotonia in infancy	55-71%
Genitourinary malformations	5-16%
Seizure disorder	11-15%
Intention tremor	6-20%
Congenital hip dysplasia	2-12%
Constipation/Abdominal pains	12-45%
Premature ovarian failure	unknown