The level of ECP in the tears of each eye and the statistical analysis of the change. a. The level of ECP in the tears of each eye at before- and 2 and 4–6 weeks after the start of rebamipide treatment (ECP was not measured in case 1). b. The statistical analysis of the change in the tear level of IL-8 in the four eyes. Pretreatment levels are recorded as 1 on the y axis. The length of treatment is indicated on the x axis. Data are the mean (95% confidence limits) ± SD.