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Table 2 Estimated 2016 US prevalence of SMA by type assuming a birth prevalence of 9.4 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 1610 1180
II 3944 3682
III 3875 3875
All 9429 8737
  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