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Table 2 Number and age of onset of patients with SMA3 by SMN2 copy number

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

SMA3 Number of patients with three copies of SMN2 Mean age of onset in patients with three copies of SMN2 Number of patients with four copies of SMN2 Mean age of onset in patients with four copies of SMN2 p value
All 133 3.01 years
(SD 3.3; 1 month–18 years)
99 6.71 years
(SD 5.86; 1 month–20 years)
< 0.0001
Female 72 2.35 years
(SD 1.9; 1 month–12 years)
30 5.13 years
(SD 4.46; 1 month–16 years)
< 0.0001
Male 61 3.78 years
(SD 4.3; 0.5–18 years)
69 7.1 years
(SD 5.85 years; 1 month–20 years)
< 0.0001
  1. Data available for 232 patients. Values are expressed as mean (SD; range)