4 doctors weighed in:
How common is fragile x syndrome in us?
4 doctors weighed in

Dr. James Ferguson
Pediatrics
3 doctors agree
In brief: Depends on your dfn
Significant impairment (iq<70) in FAS is felt to represent 1/3600 of the population, mostly male.
A lesser form of involvement with lesser alterations in this gene (add, behavior issues) may affect 1/130-250 female & 1/250-800 males. See: www.Ncbi.Nlm.Nih.Gov/pmc/articles/pmc2888470/?Tool=pmcentrez.

In brief: Depends on your dfn
Significant impairment (iq<70) in FAS is felt to represent 1/3600 of the population, mostly male.
A lesser form of involvement with lesser alterations in this gene (add, behavior issues) may affect 1/130-250 female & 1/250-800 males. See: www.Ncbi.Nlm.Nih.Gov/pmc/articles/pmc2888470/?Tool=pmcentrez.
Dr. James Ferguson
Dr. James Ferguson
Thank
Read more answers from doctors