Table 1.
Between and within groups comparison of the examined parameters.
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| Group C | Group S | Group Z | Group X | Group ZX | p | |
| Caspase activity, %, median (range) | 2.5 (1–4) | 2 (1–3) | 2.5(1–5) | 3 (3–5) | 4 (3–6) | 0.028* |
| Oxygen saturation, %, median (range) | 18.7 (14.5–22.2) | 16.7 (11.9–22.3) | 21.7 (20.4–26.0) | 16.4 (16.0–18.7) | 22.2 (21.3–23.3) | 0.006** |
| CCT, preop, mcm, median (range) | 673.5 (664–768) | 587.5 (545–639) | 637 (528–653) | 609 (571–655) | 609 (545–652) | 0.006*** |
| CCT, postop, mcm, median (range) | 673.5 (664–768) | 587.5 (545–639) | 569 (506–635) | 622 (555–657) | 541 (532–558) | 0.001**** |
| Demarcation, mcm, median (range) | 203.5 (185–257) | 190 (185–245) | 323 (150–360) | 0.343 | ||
| Group C: control, Group S: sham, Group Z: ozonated only, Group X: cross-linked only, Group ZX: ozonated and crossl-linked, CCT: central corneal thickness, a: Kruskal–Wallis test Between groups comparisons: *Group C vs ZX, p = 0.0025; Group S vs X, p = 0.021; Group S vs ZX, p = 0.009; Mann–Whitney U-test for each **Group C vs Z, p = 0.037; Group C vs ZX, p = 0.018; Group S vs Z, p = 0.025; Group S vs ZX, p = 0.028; Group Z vs X, p = 0.006; Group X vs ZX, p = 0.009, Mann–Whitney U-test for each ***Group C vs S, p = 0.004; Group C vs Z, p = 0.004; Group C vs X, p = 0.006; Group C vs ZX, p = 0.006; Mann–Whitney U-test for each ****Group C vs S, p = 0.004; Group C vs Z, p = 0.004; Group C vs X, p = 0.006; Group C vs ZX, p = 0.006; Group S vs ZX, p = 0.018; Group X vs ZX, p = 0.028; Mann–Whitney U-test for each Pre- vs post-operative pachymetry (CCT) comparison within study groups: Group Z: wilcoxon signed rank test, p = 0.028; Group X: wilcoxon signed rank test, p = 0.768;Group ZX: wilcoxon signed rank test, p = 0.043 | ||||||