Risk Factors for Incident Myopia among Teenaged Students of the Experimental Class of the Air Force in China

Table 3

Multivariate analysis of factors associated with incident myopia.

Risk factor	OR	95% CI	value
Parental myopia
One or both	0.564	0.304–1.046	0.069
None		Reference
Baseline SER	0.070	0.036–0.137	<0.001
Outdoor activity time (per week)
≥14 h	0.464	0.227–0.950	0.036
≥9.33 h to <14 h	0.771	0.460–1.293	0.324
<9.33 h		Reference
Near-work time (per week)
≥28 h	2.579	1.314–5.061	0.006
<28 h		Reference
Reading/writing distance
≥30 cm	0.505	0.270–0.944	0.032
<30 cm		Reference
Reading/writing for ≥1 h
Frequently	0.780	0.491–1.240	0.294
None or seldom		Reference
Age at start of primary school
>6 years	0.855	0.527–1.388	0.526
≤6 years		Reference
Sleep duration (per week)
>49 h	0.968	0.600–1.562	0.895
≤49 h		Reference