Table 3.

Correlation between gradient of z-scores in lesions (difference of mean z-scores between the bands divided by distance between bands) and EDSS in patients with progressive multiple sclerosis (* indicates statistically significant values).

	Correlation coefficient for the z-score thresholds				p-values
Gradient between bands	0	1	2	3	0	1	2	3
1–2	0.265	0.210	0.194	0.182	0.057	0.135	0.168	0.196
1–5	0.257	0.220	0.201	0.200	0.065	0.117	0.152	0.156
1–10	0.307	0.305	0.310	0.321	0.027*	0.028*	0.025*	0.020*
1–20	0.294	0.310	0.325	0.328	0.034*	0.026*	0.019*	0.018*
1–30	0.303	0.307	0.328	0.315	0.029*	0.027*	0.018*	0.023*

EDSS = expanded disability status scale.