Table 1

Clinical features of each ethnic motor neuron disease group

African patients (n=15) White patients (n=45)
Mean age of onset (SD)49.9 (13.1) y50.5 (10.7) y
Mode of onset (n (%))Upper limb 8 (53)Upper limb 22 (49)
Bulbar 5 (33)Bulbar 6 (13)
Lower limb 2 (13)Lower limb 17 (38)
El Escorial criteria (n (%))Definite 3 (20)Definite 11 (24)
Probable 5 (33)Probable 17 (38)
Possible 1 (7)Possible 10 (22)
Suspected 6 (40)Suspected 7 (16)
Mean disease duration (SD) 51.4 (53.5) months42.8 (25.1) months