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Table 1 The difference of demographic features, biomechanical parameters, and clinical parameters between the OK group and the SVS group

From: The relationship between corneal biomechanical parameters and treatment outcomes of orthokeratology lenses

 

OK group

SVS group

P

Female, No. (%)

13 (54.2)

13 (56.5)

0.771

Age, year

13.1±1.8

12.3±2.6

0.254*

Spherical equivalent, D

-4.97±0.25

-4.49±0.29

0.212

Axial length, mm

25.71±0.14

25.48±0.12

0.201

IOP, mmHg

16.8±0.6

16.4±0.4

0.498

CCT, um

530.6±7.0

538.8±5.6

0.364

A1 deformation amplitude, mm

0.12±0.01

0.13±0.02

0.02

Whole eye movement maximum, ms

21.65±0.24

22.29±0.14

0.026

PachySlope, μm

72.59±2.15

52.34±1.67

<0.001

ARTh

284.07±13.94

422.14±16.65

<0.001

CBI

0.43±0.07

0.11±0.04

<0.001

Axial elongation, mm (all the patients)

0.19±0.12

0.48±0.30

<0.001

Axial elongation, mm (< -5.00D, n = 13)

0.23±0.04

0.55±0.06

< 0.001

Axial elongation, mm (≥ -5.00D, n = 33)

0.10±0.03

0.40±0.06

<0.001

  1. OK orthokeratology; SVS single-vision spectacles; D diopter; IOP intraocular pressure; CCT central corneal thickness; A1 first applanation; ARTh Ambrósio’s relational thickness to the horizontal profile; CBI Corvis biomechanical index
  2. * Independent-samples t test
  3. Chi-square test
  4. Generalized estimating equation