Table 1.
Prevalence rates of low, moderate, and high myopia among primary school, junior high school, and high school students in Chengdu n (%).
| Participant | Characteristics | Myopia n (%) | Low myopia n (%) | Moderate myopia n (%) | High myopia n (%) |
|---|---|---|---|---|---|
| Gender | all | 203152 | 109636 (26.3) | 78616 (18.8) | 14900 (3.6) |
| male | 101239 | 54249 (25.0) | 39353 (18.1) | 7637 (3.5) | |
| Female | 101913 | 55387 (27.6) | 39263 (19.6) | 7263 (3.6) | |
| P values | <0.001a | <0.001a | <0.001a | ||
| Age(year) | 6 | 3791 | 3517 (7.0) a | 233 (0.5) a | 41 (0.1) a |
| 7 | 5364 | 4820 (11.5) b | 484 (1.2) b | 60 (0.1) b | |
| 8 | 8797 | 7460 (20.4) c | 1239 (3.4) c | 98 (0.3) c | |
| 9 | 13637 | 10731 (28.7) d | 2742 (7.3) d | 164 (0.4) d | |
| 10 | 16519 | 11980 (34.6) e | 4246 (12.3) e | 293 (0.8) e | |
| 11 | 18696 | 12060 (36.2) f, g | 6132 (18.4) f | 504 (1.5) f | |
| 12 | 22253 | 12727 (36.5) g | 8577 (24.6) g | 949 (2.7) g | |
| 13 | 23322 | 11631 (35.8) f | 10154 (31.2) h | 1537 (4.7) h | |
| 14 | 23806 | 10287 (33.2) h | 11306 (36.4) i | 2213 (7.1) i | |
| 15 | 24311 | 9686 (31.4) i | 11897 (38.6) j | 2728 (8.9) j | |
| 16 | 19258 | 7050 (28.7) d | 9736 (39.7) k | 2472 (10.1) k | |
| 17 | 16865 | 5607 (26.7) j | 8585 (40.8) l | 2673 (12.7) l | |
| 18 | 6533 | 2080 (25.6) j | 3285 (40.4) k, l | 1168 (14.4) m | |
| P values | <0.001a | <0.001a | <0.001a | ||
| Education level | elementary school | 248194 | 55662 (22.4) a | 18300 (7.4) a | 1510 (0.6) a |
| middle school | 99300 | 33989 (34.2) b | 32790 (33.0) b | 5954 (6.0) b | |
| high school | 69843 | 19985 (28.6) c | 27526 (39.4) c | 7436 (10.6) c | |
| P values | <0.001a | <0.001a | <0.001a |
The same letters a-l indicate that there was no statistically significant difference between the two groups.
a
Indicates that there is statistical significance in the differences between different groups.