58 Figure 3 Boxplots with median, interquartile range and min-max values of questionnaire from the fatigue assessment scale (FAS), mean pain score on the visual analogue scale (VAS), restless legs rating scale (RLS) and the cognitive failure questionnaire (CFQ). Results are divided between healthy controls (HC), sarcoidosis patients without SFN (No SFN) and sarcoidosis patients with SFN (SFN). p-values were displayed as stars: *<0.05; **<0.01; ***<0.001; ****<0.0001. Correlation FAS, VASmean, VASmax, RLS and CFQ all show a significant correlation with each other in patients with sarcoidosis with SFN. The FAS shows a correlation above 0.5 with all questionnaires and therefore shows a strong correlation with RLS, VASmean, VASmax, CFQ and each other. Next to strong correlations with the FAS, VASmean and VASmax show a strong correlation with RLS and CFQ, see Figure 4. Figure 4 Correlation plot between fatigue assessment scale (FAS), mean and maximal (max) pain score on the visual analogue scale (VASmean, VAS max), restless legs syndrome (RLS) rating scale and cognitive failure questionnaire (CFQ). All displayed correlations are significant (p<0.05). The colors represent the Pearson correlation coefficient between -1 and 1, where 1 indicates the strongest possible correlation and 0 indicates no correlation. 3 61 3
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