Table 3.
Myopia Severity Category by Gender, Grades, Average Annual Sunshine Duration, and Temperature
| Risk Factors | Low Myopia | Moderate Myopia | High Myopia | All | |||||
|---|---|---|---|---|---|---|---|---|---|
| Prevalence, % | 95% CI | Prevalence, % | 95% CI | Prevalence, % | 95% CI | Prevalence, % | 95% CI | ||
| Gender | |||||||||
| Boys | 21.0 | 19.4–22.6 | 5.0 | 4.2–5.9 | 0.5 | 0.3–0.9 | 26.5 | 24.7–28.3 | c2 = 6.2, P = 0.013 |
| Girls | 23.7 | 21.9–25.6 | 5.6 | 4.6–6.6 | 0.5 | 0.2–0.9 | 29.8 | 27.8–31.8 | |
| Grades | |||||||||
| 1 | 7.30 | 5.5–9.4 | 0.30 | 0.0–1.0 | 0.0 | 0.0–0.5 | 7.5 | 5.8–9.7 | c2 = 559.5, P < 0.001 |
| 2 | 12.10 | 9.9–14.7 | 0.90 | 0.4–1.9 | 0.1 | 0.0–0.7 | 13.2 | 10.9–15.8 | |
| 3 | 19.00 | 16.3–21.9 | 2.30 | 1.3–3.5 | 0.1 | 0.0–0.7 | 21.4 | 18.6–24.4 | |
| 4 | 26.60 | 23.5–29.9 | 4.80 | 3.4–6.6 | 0.0 | 0.0–0.5 | 31.4 | 28.1–34.9 | |
| 5 | 33.90 | 30.5–37.5 | 10.00 | 7.9–12.4 | 0.7 | 0.2–1.6 | 44.6 | 41.0–48.3 | |
| 6 | 35.00 | 31.7–38.5 | 13.60 | 11.3–16.3 | 1.9 | 1.1–3.2 | 50.6 | 47.0–54.2 | |
| Annual sunshine duration (hours) | |||||||||
| 1500–1900 | 24.00 | 22.3–25.8 | 5.10 | 4.2–6.0 | 0.6 | 0.4–1.1 | 29.7 | 27.9–31.6 | c2 = 8.0, P = 0.018 |
| 1900–2300 | 21.40 | 19.1–23.9 | 5.40 | 4.2–6.9 | 0.4 | 0.1–1.0 | 27.3 | 24.7–30.0 | |
| 2300 | 19.50 | 17.2–21.9 | 5.60 | 4.3–7.1 | 0.2 | 0.0–0.6 | 25.2 | 22.7–27.8 | |
| Annual temperature (°C) | |||||||||
| 5–15 | 20.40 | 18.8–22.2 | 5.50 | 4.6–6.5 | 0.3 | 0.1–0.6 | 26.3 | 24.5–28.1 | c2 = 9.7, P = 0.008 |
| 15–25 | 24.30 | 21.8–26.8 | 3.20 | 2.3–4.4 | 0.6 | 0.2–1.3 | 28.1 | 25.5–30.8 | |
| 25 | 23.80 | 21.3–26.3 | 6.90 | 5.5–8.5 | 0.7 | 0.3–1.3 | 31.3 | 28.6–34.1 | |
Note: P value was calculated using the Pearson Chi-squared tests, comparing the total prevalence among groups.