Table IV.

Correlations (Spearman’s) between normalized progression slopes (signal-to-noise ratio: SNR) of PERG amplitude/phase and SAP MD/PSD. For each variable, SNR is defined as progression slope divided by the corresponding slope standard error.

OD amplitude	N=95	MD	PSD
	Rho	−0.01	−0.11
	p	0.79	0.30
OD phase	N=95	MD	PSD
	Rho	0.04	0.21
	p	0.78	0.13
OS amplitude	N=95	MD	PSD
	Rho	0.12	0.03
	p	0.39	0.84
OS phase	N=95	MD	PSD
	Rho	0.24	−0.02
	p	0.09	0.90