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Table 1 Distribution of SMN2 copy number by SMA type

From: Observation of the natural course of type 3 spinal muscular atrophy: data from the polish registry of spinal muscular atrophy

Number of SMN2 copies SMA1
n = 140
(% of SMA1 patients)
SMA2
n = 182
(% of SMA2 patients)
SMA3
n = 344
(% of SMA3 patients)
SMA4
n = 6
(% of SMA4 patients)
1 2 (1.4%) 1 (0.5%) 0 0
2 53 (38%) 14 (7.7%) 21 (6%) 0
3 80 (57%) 149 (82%) 185 (54%) 1 (17%)
4 5 (3.6%) 18 (10%) 138 (40%) 5 (83%)
  1. Data available for 672 patients