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Table 5 Comparison of the distribution of SMN2 copy number in SMA patients and healthy individuals

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 2 (4.8%) 0 (0%)