Table 2. Correlations of secondary measures with MHFMS and age for SMA subjects.

	MHFMS	Age
Age	0.07 (p = 0.45)
BMI z-score	0.17 (p = 0.09)	0.12(p = 0.20)
FVC % predicted	0.70 (p<0.001)	−0.14(p = 0.31)
10 meter walk	−0.28 (p = 0.13)	−0.36(p = 0.045)

Of the secondary outcome measures, only forced vital capacity (FVC) significantly correlated with the primary outcome measure – the Modified Hammersmith Motor Function Scale. While BMI is thought to have a strong effect on function in individuals affected by SMA, the correlation did not reach significance here. Not surprisingly, FVC and walking were negatively correlated with age.