Table 1 Characteristics of Study Participants (N = 4801)
From: Prevalence of myopia and vision impairment in school students in Eastern China
Demographics | |
Age in Years | n (%) |
5 | 1 (0.02%) |
6 | 292 (6.1%) |
7 | 345 (7.2%) |
8 | 359 (7.5%) |
9 | 369 (7.7%) |
10 | 360 (7.5%) |
11 | 385 (8.0%) |
12 | 353 (7.3%) |
13 | 374 (7.8%) |
14 | 365 (7.6%) |
15 | 371 (7.7%) |
16 | 361 (7.5%) |
17 | 370 (7.7%) |
18 | 370 (7.7%) |
19 | 121 (2.5%) |
20 | 5 (0.1%) |
Mean (SD) | 12.3 (3.8) |
Gender | |
Male | 2647 (55.1%) |
Female | 2154 (44.9%) |
Grade | |
Kindergarten | 381 (7.9%) |
Grade 1 | 331 (6.9%) |
Grade 2 | 366 (7.6%) |
Grade 3 | 371 (7.7%) |
Grade 4 | 367 (7.6%) |
Grade 5 | 376 (7.8%) |
Grade 6 | 368 (7.7%) |
Grade 7 | 376 (7.8%) |
Grade 8 | 360 (7.5%) |
Grade 9 | 346 (7.2%) |
Grade 10 | 383 (8.0%) |
Grade 11 | 373 (7.8%) |
Grade 12 | 403 (8.4%) |
School location | |
Urban | 2691 (56.1%) |
Rural | 2110 (43.9%) |
School workload | |
Low | 303 (6.3%) |
Moderate | 3841 (80.0%) |
High | 657 (13.7%) |
Spherical equivalent of more myopic eye | |
< −6.0 D | 454 (9.5%) |
-6.0 to <−0.5 | 3264 (68.0%) |
-0.5 to 0.5 D | 973 (20.3%) |
> 0.5 D | 110 (2.3%) |
Uncorrected visual acuity in worse eye in vision | |
Worse than 20/200 | 50 (1.0%) |
20/200 | 314 (6.5%) |
20/166 | 300 (6.3%) |
20/133 | 400 (8.3%) |
20/100 | 325 (6.8%) |
20/80 | 351 (7.3%) |
20/66 | 301 (6.3%) |
20/50 | 290 (6.0%) |
20/40 | 313 (6.5%) |
20/33 | 180 (3.8%) |
20/25 | 454 (9.5%) |
20/20 | 1082 (22.5%) |
20/16 | 328 (6.8%) |
20/13 | 103 (2.1%) |
20/10 | 10 (0.2%) |
Wearing glasses | |
No | 2766 (57.6%) |
Yes | 2034 (42.4%) |
Myopia: Spherical equivalent < −0.5D and visual acuity < 20/25 or worse | 3030 (63.1%) |
High myopia: Spherical equivalent < −6.0D and visual acuity 20/25 or worse | 452 (9.4%) |