Table 1.

Summary of statistical results.

	Gradient 1	Gradient 2	Gradient 3
r-values	[−0.22, 0.34]	[−0.30, 0.39]	[−0.23, 0.32]
median	0.11	−0.01	0.16
W	71.00	189.00	35.00
p-values	.0027*	.76	.0001*

W; Wilcoxon signed-rank test. * Statistically significant (p<0.05)