What is the prevalence of cartilage-hair hypoplasia (CHH)?

Updated: Aug 06, 2019
  • Author: Alan P Knutsen, MD; Chief Editor: Harumi Jyonouchi, MD  more...
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Cartilage-hair hypoplasia is a rare defect. It has been described in both Amish and non-Amish populations. In the Amish, the gene frequency was reported to be 1 per 1340 population with a carrier rate of 1 per 19 population. [6] A recent study examined the temporal trends of primary immunodeficiency diseases. [18]

In Finland, the frequency of cartilage-hair hypoplasia was reported to be 1 case per 23,000 live births, with a carrier rate of 1 case per 76 live births. [19]

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