Table 1.

Phenotypic characteristics associated with fragile X: checklist and scoring system^*

	Score
Characteristics	0	1	2
Mental retardation	IQ > 85	IQ 70-85	IQ < 70
Family history	None	Maternal female with psychiatric disorder	Maternal history of X-linked mental retardation
Elongated face	Not present	Somewhat	Present
Large or prominent ears	Not present	Somewhat	Present
Attention deficit hyperactivity disorder	Not present	Hyperactivity	Present
Autistic-like behavior†	Not present	1 behavior	>1 behavior

^*From Giangreco et al.¹²

^†Tactile defensiveness, perseverative speech, hand flapping, poor eye contact.