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Comparative mean life expectancies across SMA types 1–3.
| Type | Numbers of patients | Alive n (%) | Deceased n (%) | Mean life expectancy (y) | 95 % confidence interval |
|---|---|---|---|---|---|
| SMA1 | 37 | 8 (21.6) | 29 (78.4) | 2.2 | 1.4 - 3.1 |
| SMA2 | 53 | 44 (83.0) | 9 (17.0) | 11 | 5.0–15.0 |
| SMA3 | 23 | 21 (91.3) | 2 (8.7) | 16.5 | 16.2–16.7 |
