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  Indian J Med Microbiol
 

Figure 2: The measurements of keratometry before and after epi-on CXL and epi-off CXL. (a) The mean keratometry. *Wilcoxon signed-rank test, the reduction of Kmeanin epi-off CXL: P = 0.005 at 12 months and P = 0.005 at 18 months' follow-up, and in epi-on CXL: P = 0.06 at 12 months and P = 0.06 at 18 months' follow-up. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of reduction of Kmeanat 18 months' follow-up, P = 0.011. (b) The maximum keratometry. *Wilcoxon signed-rank test, the reduction of Kmaxin epi-off CXL: P = 0.005 at 12 months and P = 0.005 at 18 months' follow-up and in epi-on CXL: P = 0.05 at 12 months and P = 0.05 at 18 months' follow-up. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of reduction of Kmaxat 18 months, P = 0.04. CXL=Corneal collagen cross-linking

Figure 2: The measurements of keratometry before and after epi-on CXL and epi-off CXL. (a) The mean keratometry. *Wilcoxon signed-rank test, the reduction of <i>K</i><sub>mean</sub>in epi-off CXL: <i>P</i> = 0.005 at 12 months and <i>P</i> = 0.005 at 18 months' follow-up, and in epi-on CXL: <i>P</i> = 0.06 at 12 months and <i>P</i> = 0.06 at 18 months' follow-up. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of reduction of <i>K</i><sub>mean</sub>at 18 months' follow-up, <i>P</i> = 0.011. (b) The maximum keratometry. *Wilcoxon signed-rank test, the reduction of <i>K</i><sub>max</sub>in epi-off CXL: <i>P</i> = 0.005 at 12 months and <i>P</i> = 0.005 at 18 months' follow-up and in epi-on CXL: <i>P</i> = 0.05 at 12 months and <i>P</i> = 0.05 at 18 months' follow-up. †</sup>Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of reduction of <i>K</i><sub>max</sub>at 18 months, <i>P</i> = 0.04. CXL=Corneal collagen cross-linking