Number of PTK | Preoperative BCDVA (mean value) | Postoperative BCDVA (mean value) | Sample size(n) | Estimate of mean difference | Standard error | P value (linear mixed model) |
---|---|---|---|---|---|---|
1st | 1.12 ± 0.15 | 0.36 ± 0.07 | 10 | −0.758 | 0.043 | < 0.001 |
2nd | 1.24 ± 0.13 | 0.44 ± 0.15 | 10 | −0.798 | 0.052 | < 0.001 |
3rd | 1.26 ± 0.11 | 0.37 ± 0.08 | 7 | −0.883 | 0.056 | < 0.001 |
4th | 1.30 | 0.40 | 1 | – | – | – |