Table 1 Incidence of myopia among grade 1 and 7 students
Population at risk (N) | n | Incidence (%) | 95% confidence interval | P* | |
|---|---|---|---|---|---|
Grade 1 | |||||
All | 2377 | 798 | 33.6 | 31.7–35.5 | |
Boys | 1317 | 431 | 32.7 | 30.2–35.3 | 0.33 |
Girls | 1060 | 367 | 34.6 | 31.8–37.5 | |
Grade 7 | |||||
All | 1545 | 834 | 54.0 | 51.5,56.5 | |
Boys | 866 | 415 | 47.9 | 44.6,51.3 | < 0.001 |
Girls | 679 | 419 | 61.7 | 58.0,65.4 | |