Table 3.

Factors for increase in axial length of 1.2 mm or more.

		Univariate Logistic Regression
		OR	95% CI		p-Value
Age (y)		0.28	0.16	0.51	<0.0001
Female		0.56	0.19	1.60	0.279
Change in BMI		0.54	0.30	0.98	0.044
Continuous near-work time (min)		1.00	0.99	1.02	0.643
Continuous near-work time (digital devices) (min)		1.00	0.99	1.02	0.556
Already wearing glasses at first visit		4.67	1.28	17.06	0.020
Near-work time (min)		1.00	0.99	1.00	0.617
Near-work time (digital devices) (min)		1.00	0.99	1.01	0.907
Near-work time (books) (min)		0.99	0.97	1.00	0.171
Outdoor activity time (min)		1.00	0.98	1.01	0.410
Birth weight (kg)		1.00	1.00	1.00	0.403
Birth height (cm)		1.05	0.84	1.32	0.648
Parental myopia
	Only father	1.00		ref
	Only mother	0.00	0.00		0.997
	Both parents	0.17	0.05	0.55	0.003
Distance from the television (cm)		0.87	0.48	1.57	0.652
Near-working distance (cm)		1.00	0.93	1.09	0.930
Brightness of the bedroom while sleeping
	Bright	0.00	0.00		0.999
	Dim	0.73	0.25	2.15	0.570
	Dark	1.00		ref
Bedtime (hr)		0.38	0.15	0.96	0.041
Sleeping hours (hr)		1.86	0.84	4.09	0.124
Extracurricular activities (outside) (min)		0.60	0.13	2.75	0.507

OR: odds ratio; 95% CI: 95% confidence interval; ref: reference standard; BMI: body mass index.