From: Molecular characterization and copy number of SMN1, SMN2 and NAIP in Chinese patients with spinal muscular atrophy and unrelated healthy controls
Number of normalSMN2
SMA patients (N = 42)
Healthy individuals (N = 212)
P
0
0 (0%)
10 (4.7%)
1
2 (4.8%)
70 (33.1%)
2
14 (33.3%)
130 (61.3%)
<0.001
3
24 (57.1%)
2 (0.9%)
4