marginal significancep < 0.1
2 , with * indicating a p value < 0.05 and ¶ indicating marginal significance (0.05 ≤ p < 0.1) for comparisons of the no-DR, NPDR, and PDR groups with the control group.
2 , with * indicating a p value < 0.05 and ¶ indicating marginal significance (0.05 ≤ p < 0.1) for comparisons of the no-DR, NPDR, and PDR groups with the control group.
Finally, linear trend was used to examine if contrast thresholds exhibited an increasing trend as diabetic retinopathy severity progressed.
The results of one-way ANOVA indicated significant (along the protan and deutan axes) and marginally significant (tritan axis) differences in the mean contrast thresholds between the control, no-DR, NPDR, and PDR groups (Table 2 ).