Table 2.
Total number of sibships in the Cure SMA sibling database from 1996–2016 (627 individuals in 303 families)
| Number of siblings per family | Number of families, n (%) |
| 2 | 285 (94.1) |
| 3 | 15 (5.0) |
| 4 | 3 (1.0) |
| Total | 303 (100.0) |
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