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Summary of unique patients included in these analyses from the Cure SMA sibling database from 1996–2016
| Sex, n (%) | SMA Type I | SMA Type II | SMA Type III | SMA Type IV | Total |
| Female | 148 (48.5) | 108 (35.4) | 49 (16.1) | 0 | 305 (48.6) |
| Male | 164 (50.9) | 100 (31.1) | 52 (16.1) | 6 (1.9) | 322 (51.4) |
| Total | 312 (49.8) | 208 (33.2) | 101 (16.1) | 6 (1.0) | 627 (100.0) |
SMA, spinal muscular atrophy.
