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Table 2 Baseline demographics and biometric data of subjects enrolled in the study

From: The control effect of orthokeratology on axial length elongation in Chinese children with myopia

  Ortho-k Control P value
Total N = 65 N = 63  
Age (y) 9.82 ± 1.63 9.86 ± 2.12 0.923*
M/F ratio 23:42 26:37 0.134†
SER (D) −4.29 ± 2.04 −4.24 ± 2.38 0.898*
Corneal curvature (D) 43.45 ± 1.27 43.45 ± 1.47 0.999*
Axial length (mm) 24.91 ± 0.83 24.85 ± 1.08 0.725*
Low myopia N = 20 N = 20  
Age (y) 9.23 ± 1.53 8.87 ± 1.71 0.481*
M/F ratio 7:13 8:12 0.744†
SER (D) −1.99 ± 0.56 −1.64 ± 0.62 0.074*
Corneal curvature (D) 43.07 ± 1.54 43.41 ± 1.71 0.521*
Axial length (mm) 24.29 ± 0.73 23.97 ± 0.87 0.207*
Moderate myopia N = 23 N = 21  
Age (y) 9.72 ± 1.22 10.16 ± 1.82 0.358*
M/F ratio 9:14 9:12 0.802†
SER (D) −3.97 ± 0.77 −3.82 ± 0.53 0.439*
Corneal curvature (D) 43.45 ± 1.02 43.56 ± 1.41 0.765*
Axial length (mm) 24.78 ± 0.40 24.74 ± 0.83 0.829*
High myopia N = 22 N = 22  
Age (y) 10.48 ± 1.92 10.47 ± 2.46 0.995*
M/F ratio 7:15 9:13 0.531†
SER (D) −6.72 ± 0.62 −7.01 ± 1.18 0.316*
Corneal curvature (D) 43.79 ± 1.19 43.39 ± 1.33 0.290*
Axial length (mm) 25.61 ± 0.73 25.77 ± 0.70 0.477*
  1. *Unpaired t-test.
  2. †Chi-square test.