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Cox proportional hazards analysis: influence of onset age (months) and sex on survival in SMA types 1 and 2.
| Type | Factor | Hazard ratio | Standard error | z | P > z | 95 % confidence interval |
|---|---|---|---|---|---|---|
| SMA1 | Age at onset (mo) | 0.830 | 0.076 | −2.02 | 0.043 | 0.693–0.994 |
| SMA2 | Age at onset (mo) | 0.804 | 0.075 | −2.31 | 0.021 | 0.669–0.967 |
| Sex | 12.294 | 14.732 | 2.09 | 0.036 | 1.174–128.733 |
