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Table 4 Relationship between Refractive error regression after PRK Surgery and preoperative variables in people with both eyes regressed and both eyes non-regressed

From: Studying the factors related to refractive error regression after PRK surgery

Variables

People whose both eyes were non regressed after surgery

People whose both eyes were regressed after surgery

Right eye

N = 107

Left eye

N = 107

Test

Right eye

N = 20

Left eye

N = 20

Test

Mean ± SD

Mean ± SD

P value§

Mead(min-max)

Mead(min-max)

P value®

Thickness (μm)

536.7 ± 32.6

537.6 ± 34.7

0.84

537.5 (499–572)

531 (501–575)

0.49

Irregularity5(mm)

1.33 ± 0.31

1.36 ± 0.38

0.55

1.35 (1.00–2.70)

1.25 (0.9–2.6)

0.45

Astigmatism(D)

0.99 ± 0.70

1.07 ± 0.73

0.43

1.62 (0–3.75)

1.87 (0–4.25)

0.43

Sphere (D)

3.17 ± 1.69

3.12 ± 1.70

0.84

6.25 (0.25–12)

7.87 (0–11.50)

0.41

SimK (D)

0.97 ± 0.49

1.04 ± 0.51

0.30

1.25 (0.25–2.90)

1.50 (0.50–2.90)

0.92

  1. PRK Photorefractive keratectomy, Sim k astigmatism: simulated keratometry astigmatism, P value: §: Independent sample t. test ®; Mann –Whitney U independent sample test