GSTM1 and autosomal dominant cerebellar ataxia: Individuals with SCA accounted for 72.5% of the patients with a known genotype and 79.9% of the hospital discharges; Hb SC accounted for 21.4% of patients and 15.3% of discharges; Hb Sβ+ thalassemia accounted for 5.5% of patients and 4.2% of discharges.