Characteristics of participants with and without myopia
| Characteristics | Total | Myopia | |
| (n=864 828) | No (n=391 711) | Yes (n=473 117) | |
| Age, mean±SD, years | 11.50±2.79 | 10.16±2.44 | 12.60±2.56 |
| Sex | |||
| Male, no (%) | 449 414 (51.97) | 215 479 (47.95) | 233 935 (52.05) |
| Female, no (%) | 415 414 (48.03) | 176 232 (42.42) | 239 182 (57.58) |
| SE of right eye, M (P25, P75), D | −0.88 (−2.63, 0.00) | 0.00 (−0.38, 0.38) | −2.38 (−3.88, –1.25) |
| SE of left eye, M (P25, P75), D | −0.75 (−2.50, 0.00) | 0.00 (−0.38, 0.38) | −2.25 (−3.68, –1.00) |
| UCVA of right eye, mean±SD | 4.72±0.37 | 5.00±0.18 | 4.50±0.33 |
| UCVA of left eye, mean±SD | 4.74±0.36 | 5.00±0.17 | 4.53±0.33 |
| Regions | |||
| Six central districts, no (%) | 306 172 (35.40) | 141 824 (46.32) | 164 348 (53.68) |
| Four districts adjacent to the centre, no (%) | 174 632 (20.19) | 81 316 (46.56) | 93 316 (53.44) |
| Suburb, no (%) | 384 024 (44.40) | 168 571 (43.90) | 215 453 (56.10) |
D, dioptre; SE, spherical equivalent; UCVA, uncorrected visual acuity.