SMN2 and proximal spinal muscular atrophy: cGFAP concentrations were higher in patients with SMA type 2 compared to type 3 (F (2, 74) = 3.673, p < 0.05, partial η2 = 0.090) after adjustment for patients' age, but did not differ between SMA type 1 versus 2 or type 1 versus 3 or compared to controls or regarding SMN2 copy number (F (4, 51) = 0.333, p = 0.855).