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Table 1 Biometric measurements of study subjects

From: The effect of orthokeratology treatment zone decentration on myopia progression

Variables
mean ± SD, n (%)
All
n= 217
Mildly
n = 65
Moderately
n = 114
Severely
n = 38
P-valuea
Age (years) 12.43 ± 1.73 12.49 ± 1.75 12.45 ± 1.58 12.26 ± 2.10 0.621
Gender (male) 102 (47) 31 (48) 56 (49) 15 (40) 0.582
SER -3.10 ± 1.20 -2.95 ± 1.30 -3.10 ± 1.20 -3.30 ± 1.04 0.328
SRE -3.0 ± 1.12 -2.86 ± 1.16 -3.01 ± 1.12 -3.19 ± 1.04 0.285
RA 90 (41) 28 (43) 48 (42) 15 (39) 0.937
Baseline AL 24.81 ± 0.83 24.75 ± 0.90 24.80 ± 0.80 24.97 ± 0.77 0.417
Flat K 42.70 ± 1.28 42.81 ± 1.49 42.69 ± 1.19 42.51 ± 1.18 0.530
Steep K 43.66 ± 1.39 43.74 ± 1.56 43.68 ± 1.33 43.45 ± 1.33 0.660
DD, mm 0.69 ± 0.32 0.35 ± 0.11 0.71 ± 0.13 1.21 ± 0.22 <0.001
DA 192.43 ± 74.33 189.89 ± 76.90 188.03 ± 74.17 209.94 ± 69.58 0.111
Flat E 0.59 ± 0.14 0.61 ± 0.12 0.59 ± 0.15 0.56 ± 0.15 0.324
  1. SER Spherical equivalent refractive error, SRE Spherical refractive error, RA Regular astigmatism, AL Axial length, DD Decentered distance, DA Decentered Angle
  2. aAccording to the distribution, Kruskal–Wallis H test or ANOVA was adopted to compare characteristics among the three groups.