Table 3.
Mean CV before and after cross-linking with P-values
| Parameters | Preoperative | 3 months | 6 months | 1 year | P-value |
|---|---|---|---|---|---|
| Keratoconus | |||||
| Mean | 35.03 | 45.85 | 36.60 | 35.65 | <0.001 |
| ±SD | 7.13 | 8.80 | 5.61 | 5.30 | |
| P1 | 0.000 | 0.644 | 1.000 | ||
| P2 | 0.000 | 0.000 | |||
| P3 | 0.212 | ||||
| PostLASIK ectasia | |||||
| Mean | 26.60 | 38.40 | 33.80 | 32.60 | <0.001 |
| ±SD | 1.58 | 6.48 | 4.02 | 3.50 | |
| P1 | 0.003 | 0.000 | 0.001 | ||
| P2 | 0.191 | 0.450 | |||
| P3 | 1.000 | ||||
Notes: Significant at P<0.05; repeated-measures ANOVA test followed by post hoc LSD was used for pairwise comparisons. P1: Significance relative to preoperative; P2: significance relative to 3-month period; P3: significance relative to 6-month period.
Abbreviations: ANOVA, analysis of variance; CV, coefficient of variance; LASIK, laser-assisted in situ keratomileusis; LSD, least significant difference; SD, standard deviation.