Table 1.
Baseline characteristics of participants in different datasetsa
| Developmental dataset | Internal test set | External test set (HKCES) | ||
|---|---|---|---|---|
| Training set | Tuning set | |||
| Number of images | 16,617 | 2421 | 4942 | 26,424 |
| Number of participantsb | 5803 (7176) | 829 (1027) | 1658 (2079) | 7610 (14,983) |
| Boy, % | 3052 (52.59) | 431 (51.99) | 879 (53.02) | 3871 (50.87) |
| Age, years | 8.45 ± 2.71 | 8.55 ± 2.73 | 8.50 ± 2.74 | 7.67 ± 1.34 |
| Height, cm | 132.37 ± 15.65 | 132.09 ± 15.68 | 132.85 ± 16.04 | 124.9 ± 9.71 |
| Weight, kg | 32.05 ± 13.78 | 32.88 ± 14.94 | 32.52 ± 15.80 | 25.89 ± 7.58 |
| BMI, kg/m2 | 17.59 ± 3.54 | 17.89 ± 5.45 | 17.67 ± 5.07 | 16.37 ± 3.51 |
| SE, D | −2.0 ± 4.14 | −2.07 ± 4.29 | −2.21 ± 4.28 | 0.14 ± 1.60 |
| AL, mm | 24.12 ± 1.85 | 24.13 ± 1.86 | 24.23 ± 1.90 | 23.11 ± 0.97 |
| Myopia, % | 3053 (42.54) | 435 (42.36) | 918 (44.16) | 3784 (25.26) |
| Low myopia, % | 1241 (17.29) | 164 (15.97) | 368 (17.70) | 3654 (24.39) |
| High myopia, % | 1812 (25.25) | 271 (26.39) | 550 (26.46) | 130 (0.87) |
Myopia was defined as SE ≤ −0.50D, low myopia as −6.00D < SE ≤ −0.50D, and high myopia as SE ≤ −6.00D. BMI was calculated from measured weight and height.
BMI body mass index, SE spherical equivalent, D diopter, AL axial length, HKCES Hong Kong Children Eye Study.
aData were presented as mean ± standard deviation unless otherwise indicated.
bNumbers in brackets: the number of eyes.