Table 2.

Multiple logistic regression of the myopia risk factors in lowland and highland area.

Factors	Lowland†		Highland‡		Total§
	OR (95%CI)	P	OR (95%CI)	P	OR (95%CI)	P
Age (year)	1.72 (1.46–2.03)	<0.001	1.13 (0.90–1.41)	0.306	1.55 (1.36–1.76)	<0.001
Gender
Boys	Reference		Reference		Reference
Girls	1.30 (0.73–2.32)	0.373	1.02 (0.39–2.65)	0.969	1.20 (0.75–1.91)	0.456
BMI (kg/m2)	0.94 (0.88–1.00)	0.066	0.90 (0.76–1.06)	0.208	0.94 (0.88–0.99)	0.029
25(OH)D (ng/mL)	1.01 (0.98–1.04)	0.706	0.94 (0.87–1.02)	0.141	0.99 (0.97–1.02)	0.676
Outdoor time (h/w)	0.95 (0.90–1.01)	0.120	–	–	–	–
Near vision time (h/w)	1.02 (0.99–1.04)	0.273	–	–	–	–
Region
Highland	–	–	–	–	Reference
Lowland	–	–	–	–	2.13 (1.10–4.15)	0.026

OR with statistically significance were listed in bold.

^†Adjustment for age, gender, BMI, outdoor time and near vision time.

^‡Adjustment for age, gender, and BMI.

^§Adjustment for age, gender, BMI and region.