Table 3 Refractive status and prevalence of myopia in grade 1 to 3 students in Hubei Province from 2019 to 2021

All

-0.13 (-0.58, 0.27)

-0.72 (-1.18, -0.54)

-1.27 (-1.51, -0.96)

< 0.001

24.08%

28.13%

30.54%

< 0.001

Grade 1 (7 ~ 8 y)

Total

0.20 (0.17, 0.27)

-0.48 (-0.53, -0.44)

-0.73 (-1.02, -0.94)

< 0.001

17.56%

19.31%

24.16%

< 0.001

Male

0.32 (0.23, 0.41)

-0.41 (-0.52, -0.37)

-0.68 (-0.74, -0.61)

< 0.001

15.37%

17.47%

21.49%

< 0.001

Female

0.16 (0.12, 0.26)

-0.56 (-0.64, -0.49)

-0.84 (-0.89, -0.75)

< 0.001

19.26%

21.35%

26.74%

< 0.001

Grade 2 (8 ~ 9 y)

Total

-0.44 (-0.04, 0.02)

-0.69 (-0.69, -0.62)

-1.06 (-1.10, -1.01)

< 0.001

20.90%

29.65%

32.24%

< 0.001

Male

-0.36 (-0.42, -0.31)

-0.58 (-0.64, -0.52)

-0.95 (-1.04, -0.87)

< 0.001

18.27%

27.74%

29.76%

< 0.001

Female

-0.52 (-0.63, -0.47)

-0.75 (-0.80, -0.68)

-1.14 (-1.19, -1.05)

< 0.001

23.83%

30.94%

35.85%

< 0.001

Grade 3 (9 ~ 10 y)

Total

-0.65 (-0.33, -0.26)

-1.00 (-1.04, -0.96)

-1.41 (-1.52, -1.37)

< 0.001

34.08%

37.97%

40.37%

< 0.001

Male

-0.54 (-0.61, -0.49)

-0.84 (-0.92, -0.78)

-1.32 (-1.41, -1.27)

< 0.001

30.53%

34.29%

38.54%

< 0.001

Female

-0.74 (-0.82, -0.65)

-1.15 (-1.23, -1.06)

-1.50 (-1.56, -1.43)

< 0.001

36.92%

39.86%

43.91%

< 0.001