Revised Hammersmith Scale for spinal muscular atrophy: A SMA specific clinical outcome assessment tool.

Groups and discriminant validity were assessed using the Kruskal Wallis and Mann-Whitney U tests, p < 0.05 was deemed significant and p ≤ 0.001 highly significant.

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This was not statistically different in the type 3 population (SMA 3a p = 0.619, SMA 3b p = 0.187), however an overall trend with declining scores as age increased was observed.

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