Clinical and Genetic Study of Algerian Patients with Spinal Muscular Atrophy

Table 1

Classification of autosomal recessive proximal spinal atrophy as defined by Zerres et al. [26].

Type	Definition
I	Never able to sit
II	Able to sit but not to walk
	Able to walk
III	(a) Onset before 3 years
	(b) Onset 3–30 years
IV	Onset after 30 years