Table 3 The association among the number of children in a family, the growth of AL and close-work activities in different subgroups

AL > 24 mm

1.229(1.042,1.607)

0.974(0.723,1.311)

1.144(0.867,1.508)

1.341(1.069,1.723)

Myopia

0.873(0.704,1.083)

0.946(0.723,1.238)

0.811(0.630,1.044)

1.019(0.791,1.313)

Homework on weekdays > 1 h

1.009(0.736,1.384)

1.109(0.774,1.588)

1.277(1.012,1.647)

0.843(0.572,1.242)

Homework on weekends > 1 h

1.318(0.966,1.800)

1.3540.935,1.961)

1.194(0.874,1.630)

1.543(1.065,2.235)

Sleep every night > 9 h

0.926(0.650,1.319)

0.974(0.666,1.426)

0.838(0.616,1.142)

1.256(0.777,2.028)

Extracurricular classes for academic subjects ≥ 3

1.224(1.011,1.562)

0.857(0.654,1.123)

1.424(1.095,1.852)

0.784(0.611,1.007)