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Table 3 Best corrected distance visual acuity (BCDVA) before and after every phototherapeutic keratectomy

From: Multiple phototherapeutic keratectomy treatments in a Chinese pedigree with corneal dystrophy and an R124L mutation: a 20-year observational study

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