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Table 1 Estimated 2016 US SMA prevalence by type assuming a birth prevalence of 8.5 per 100,000

From: Indirect estimation of the prevalence of spinal muscular atrophy Type I, II, and III in the United States

SMA type Estimated prevalencea Estimated prevalenceb
I 1455 1067
II 3567 3330
III 3504 3504
All 8526 7901
  1. SMA spinal muscular atrophy
  2. aUsed published survival estimates from US literature only
  3. bUsed combined published survival estimates from the United States, Europe, and Australia
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Orphanet Journal of Rare Diseases

ISSN: 1750-1172