What are the sexual predilections of spinal muscle atrophy (SMA)?

Updated: May 04, 2020
  • Author: Ashish S Ranade, MBBS, MS, MRCS; Chief Editor: Jeffrey A Goldstein, MD  more...
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Males are more commonly affected with SMA than females are. The male-to-female ratio is 2:1. The clinical course in males is more severe. Life expectancy has not been demonstrated to be influenced by sex. [21]  As the age at onset increases, incidence of SMA in females decreases. With age at onset older then 8 years, females are affected much less frequently. In cases where the patient is older than 13 years at onset, incidence in females is the exception.

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