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Table 3 Estimated 2016 US prevalence of SMA by type assuming a birth prevalence of 10.3 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 1764 1293
II 4322 4035
III 4247 4247
All 10,333 9575
  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