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. 2021 Aug 28;14:4913–4922. doi: 10.2147/IJGM.S328281

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.