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Table 1 Demographic and preoperative patient information (mean ± SD)

From: Corneal higher-order aberrations of the anterior surface, posterior surface, and total cornea after small incision lenticule extraction (SMILE): high myopia versus mild to moderate myopia

Parameter

Group H

Group M

t

p

Eye (n)

65

132

  

Sex (M/F)

31/34

77/56

  

Age (y)

24.46 ± 7.34 (18 to 47)

23.84 ± 5.92 (18 to 47)

0.64

0.52

IOP (mmHg)

15.80 ± 2.12 (11 to 23)

15.48 ± 2.36 (10 to 23)

0.93

0.36

CCT (μm)

552.58 ± 25.61 (502 to 616)

541.52 ± 28.03 (482 to 627)

1.66

0.10

Mean corneal power (D)

43.16 ± 1.42 (40.60 to 46.55)

43.24 ± 1.25 (41.25 to 45.95)

−0.42

0.67

SE (D)

−7.32 ± 0.99 (−6.00 to −9.88)

−4.45 ± 1.01 (− 1.13 to − 5.88)

− 18.85

0.00*

Sphere (D)

−6.94 ± 1.00 (− 5.00 to − 9.75)

−4.13 ± 1.00 (− 0.75 to − 5.75)

− 18.60

0.00

Cylinder (D)

−0.76 ± 0.68 (0 to − 3.00)

−0.64 ± 0.50 (0 to − 2.75)

−1.35

0.18

Lenticule thickness (μm)

128.48 ± 10.27 (109 to148)

92.23 ± 15.53 (50 to 120)

19.51

0.00*

Lenticule diameter (mm)

6.52 ± 0.14 (6.1 to 6.6)

6.58 ± 0.05 (6.1 to 6.6)

−5.84

0.00*

  1. SD standard deviation, D diopters, SE spherical equivalent, CCT central corneal thickness, IOP intraocular pressure, Group H high myopia group, Group M mild to moderate myopia group.*p < 0.05