Prevalence (95% CI) of myopia, hyperopia, and astigmatism, according to non-cycloplegic refraction, among high school students and their distribution in groups of age, gender and area of residence*
| Number | Myopia | Hyperopia | Astigmatism | |
|---|---|---|---|---|
| *Percentage (95% CI) standardised for age and grade level. | ||||
| †The 95% confidence interval was calculated using binominal distribution. | ||||
| The design effect was 0.6 to 9.9. | ||||
| Age (years) | ||||
| 14 | 352 | 34.4 (27.0–41.8) | 1.6 (0.4–2.8) | 18.8 (15.9–21.7) |
| 15 | 619 | 33.2 (28.4–38.1) | 0.9 (0.2–3.5)† | 17.3 (13.7–21.0) |
| 16 | 505 | 32.6 (18.3–46.9) | 3.2 (0.1–6.3) | 16.9 (12.4–21.4) |
| 17 | 271 | 30.4 (19.7–41.0) | 3.4 (1.1–10.2)† | 19.6 (15.5–23.7) |
| 18 | 88 | 39.8 (24.7–55.0) | 0.6 (0.1–4.0)† | 20.7 (12.1–29.4) |
| Gender | ||||
| Male | 811 | 26.8 (21.0–32.6) | 2.7 (0.8–4.6) | 17.6 (16.4–18.7) |
| Female | 1050 | 39.5 (33.7–45.3) | 1.4 (0.5–2.4) | 18.5 (12.0–24.9) |
| Area of residence | ||||
| Urban | 1361 | 33.7 (23.9–43.4) | 2.3 (0.8–3.8) | 18.3 (14.7–21.9) |
| Rural | 500 | 29.4 (20.3–38.5) | 0.9 (0.5–1.4) | 16.3 (10.8–21.9) |
| Total | 1861 | 33.0 (24.9–41.1) | 2.1 (0.7–3.5) | 18.0 (14.9–21.2) |