Figure 3. Box plots. Box plots display the median and quartiles (Q_0,25 and Q_0,75) and the total range of the ocular surface disease index score, which was 8.3 in the control group (n=19) and 52.2 in the patient group (n= 27; p<0.001, Wilcoxon non parametric testing), showing that the patient group had significantly more complaints from ocular surface disease than the control group.