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Table 3 The means of the predicted axial length vs. the true axial length

From: A machine learning-based algorithm used to estimate the physiological elongation of ocular axial length in myopic children

Groups SER (D) K-mean (D) Age (years)
0 to − 3.00 −3.00 to − 6.00 < − 6.00 < 42.00 42.00 to 44.00 > 44.00 6–10 11–14 15–18
M F M F M F
No. of cases (%) 518 (51.2) 413 (40.9) 80 (7.9) 177 (17.5) 515 (50.9) 319 (31.6) 219 (21.7) 241 (23.8) 206 (20.4) 221 (21.8) 66 (6.5) 58 (5.8)
Predicted AL (mm) 24.46 25.25 26.47 25.78 25.01 24.38 24.57 24.56 25.12 25.12 25.69 25.74
True AL (mm) 24.46 25.27 26.44 25.82 25.01 24.37 24.56 24.59 25.12 25.16 25.71 25.64
Error (mm) 0 −0.02 0.03 − 0.04 0 0.01 0.01 −0.03 0 −0.04 − 0.02 0.10
95% CI for error (mm) [−0.03, 0.03] [−0.02, 0.06] [− 0.07, 0.14] [− 0.10, 0.03] [−0.03, 0.03] [− 0.03, 0.04] [− 0.04, 0.05] [−0.07, 0.02] [− 0.05, 0.06] [− 0.08, 0.01] [−0.11, 0.07] [− 0.01, 0.22]
95% CI for AL (mm) [23.72, 25.18] [24.81, 26.73] [24.50, 30.14] [23.16, 26.47] [24.19, 25.82] [23.54, 25.41] [23.60, 25.92] [22.82, 25.20] [23.85, 26.59] [23.10, 25.48] [22.83, 27.52] [25.39, 31.34]
P value 0.457 0.234 0.420 0.372 0.933 0.371 0.774 0.991 0.951 0.328 0.962 0.256
  1. SER = spherical equivalent refraction error; K-mean = mean K reading; AL = axial length; D = diopters; CI = confidence interval; M = male; F = female
  2. Based on spherical equivalent refraction error (SER), mean K reading (K-mean), age and sex distribution of all samples