Table 2.

Correlations between CSF Cys-C levels and clinical indicators

CSF Cys-C (mg/l)	FVC	ALSFRS-R	Disease duration	Age of onset	Site of onset symptoms	Rate of ALS disease progression
r-values	0.010	0.126	0.081	0.096	-0.103	-0.002
p-values	0.940	0.355	0.553	0.192	0.452	0.991

Abbreviations: ALS, amyotrophic lateral sclerosis; ALSFRS-R, the ALS functioning rating scale-revised; FVC, forced vital capacity.