Table 2 Regression analysis of factors associated with myopia

Grades

< 0.001^*

< 0.001^*

 Kindergarten

Reference

Reference

 Primary grades 1–3

5.25 (3.34, 8.25)

< 0.001^*

4.86 (3.06, 7.71)

< 0.001^*

 Primary grades 4–6

15.94 (10.14, 25.06)

< 0.001^*

19.74 (12.38, 31.49)

< 0.001^*

 Junior high schools

30.38 (19.61, 47.05)

< 0.001^*

33.97 (21.47, 53.76)

< 0.001^*

 Senior high schools

42.55 (26.75, 67.68)

< 0.001^*

61.99 (36.88, 104.19)

< 0.001^*

Gender

< 0.001^*

0.007^*

 Male

Reference

Reference

 Female

1.45 (1.26, 1.68)

< 0.001^*

1.27 (1.07, 1.51)

0.007^*

Region

0.005^*

< 0.001^*

 Urban

Reference

Reference

 Rural

1.26 (1.07, 1.49)

0.005^*

1.88 (1.54, 2.31)

< 0.001^*

Whether parents are myopic

< 0.001^*

< 0.001^*

 No

Reference

Reference

 Yes

1.32 (1.14, 1.53)

< 0.001^*

3.21 (2.64, 3.92)

< 0.001^*

Sleep time per day

< 0.001^*

< 0.001^*

 ≥ 10 h

Reference

Reference

 8–9 h

2.63 (1.63, 2.89)

< 0.001^*

1.24 (0.89, 1.72)

0.204

 < 8 h

7.89 (5.89, 10.81)

< 0.001^*

1.83 (1.27, 2.64)

0.001^*

Time spent using electronics per day

< 0.001^*

0.649

 < 30 min

Reference

Reference

 30 min–1 h

1.13 (0.94, 1.36)

0.189

1.10 (0.88, 1.36)

0.410

 1–2 h

1.68 (1.37, 2.07)

< 0.001^*

0.98 (0.76, 1.27)

0.879

 > 2 h

2.55 (2.03, 3.21)

< 0.001^*

0.91 (0.67, 1.23)

0.530

Eye health behavior levels

< 0.001^*

0.001^*

 Good

Reference

Reference

 Moderate

1.81 (1.45, 2.27)

< 0.001^*

1.52 (1.17, 1.99)

0.002^*

 Poor

2.91 (2.31, 3.67)

< 0.001^*

1.74 (1.31, 2.32)

< 0.001^*