Table 3. Statistical analysis with the univariate approach between RNFL thickness and duration of the disease (no significant correlation), and SARA score (significant negative correlation).

RNFL	Parameter	Slope and 95% CI	P-value
Univariate approach	Duration of disease (years)	0.15 (−0.35; 0.68)	0.537
	SARA score	−0.64 (−1.16; −0.29)	0.012

Abbreviations: RNFL, retinal nerve fibre layer; SARA, Scale for the Assessment and Rating of Ataxia.