From: Effects of nusinersen after one year of treatment in 123 children with SMA type 1 or 2: a French real-life observational study
SMA type
Age at treatment onset
SMN2 copy number
< 2 y
2–5 y
6–17 y
Total
2
3
4
ND
Type 1a/b
10
0
6
Type 1c
11
24
7
16
1
Type 2
9
37
43
89
5
76
30
47
46
123
18
96