Figure 2. Oxford grades were compared between the control (n=19) and the patient group (n=27). Box plots display the median and quartiles (Q_0,25 and Q_0,75) and the total range. Median grade was 0 in the control group and 3 in the patient group, which was statistically significant (p<0.001, Wilcoxon non-parametric testing), showing that the patient group depicted significantly more ocular surface staining than the control group.