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Table 1 Clinical characteristics of the study population

From: Weighted Zernike defocus coefficient of treatment zone is a meaningful indicator for myopia control efficacy of Ortho-K lenses

Parameters Mean ± SD, n (%) P value
All patients (n = 133) Axial length growth Group A (n = 70) Axial length shortening Group B (n = 63)
Age (years) 11.08 ± 2.01 10.28 ± 1.59 11.97 ± 2.06  < 0.001
Sex, male (%) 63 (47.37) 32 (45.71) 31 (49.21) 0.69
12-month axial length change (mm) 0.04 ± 0.22 0.20 ± 0.15  − 0.15 ± 0.09  < 0.001
Cweighted defocus (D/mm2) 0.39 ± 0.17 0.31 ± 0.11 0.47 ± 0.18  < 0.001
Horizontal decentration (mm)  − 0.09 ± 0.54  − 0.18 ± 0.50 0.00 ± 0.57 0.06
Vertical decentration (mm)  − 0.19 ± 0.40  − 0.14 ± 0.37  − 0.26 ± 0.42 0.03
Design, VST (%) 56 (42.11) 29 (41.43) 27 (42.86) 0.87
SE (D)  − 3.51 ± 1.64  − 3.10 ± 1.34  − 3.99 ± 2.04 0.002
Pupil diameter (mm) 3.92 ± 0.58 3.67 ± 0.51 4.19 ± 0.53  < 0.001
K mean (D) 43.33 ± 1.36 43.30 ± 1.26 43.36 ± 1.47 0.79
HVID (mm) 11.98 ± 0.43 12.03 ± 0.45 11.92 ± 0.41 0.13
E value 0.51 ± 0.10 0.51 ± 0.10 0.51 ± 0.11 0.80
ACD (mm) 3.36 ± 0.21 3.36 ± 0.20 3.37 ± 0.23 0.76
  1. VST = vision shaping treatment; SE = spherical equivalent; K = keratometry; HVID = horizontal visible iris diameter; ACD = anterior chamber depth