Table 4.

Analysis of risk factors of myopia by multiple logistic regression

	N (%)	Risk of Myopia
		OR (95%CI)	p
Agea	617	1.66 (1.48–1.86)	< 0.001a
BMI	617		0.920
Female	294 (47.6%)		0.395
Parent myopiaa
Non	302 (48.9%)	ref
One myopic	220 (35.7%)	1.98 (1.32–2.97)	0.001a
both	95 (15.4%)	2.28 (1.36–3.83)	0.002a
Take a break outdoorsa
No	414 (67.1%)	ref
Yes	203 (32.9%)	0.67 (0.45–1.00)	0.049a
PE class			0.675
< 3	66 (10.7%)		0.725
3	306 (49.6%)		0.974
4	195 (31.6%)		0.621
5	53 (8.6%)		0.585
> 5	26 (4.2%)		0.939
Cram school			0.384
No	253 (41.0%)		0.481
< 1 h	56 (9.1%)		0.734
1-2 h	135 (21.9%)		0.273
2-3 h	73 (11.8%)		0.961
> 3 h	129 (20.9%)		0.434
Electronic screen use			0.445
No	40 (6.5%)		0.363
< 30 min	203 (32.9%)		0.638
30-60 min	189 (30.6%)		0.668
1-2 h	118 (19.1%)		0.390
2-3 h	38 (6.2%)		0.094
> 3 h	58 (9.4%)		0.492

Data are presented as n (%)

^aStatistically significant