Table 3. Linear regression for the component scores and related factors.

Parameter	Standardized Regression coefficient (β)
	PC1	p	PC2	p
Model for baseline age and refraction
Baseline age (year)	−0.13**	<0.0001	−0.42**	<0.0001
Baseline refraction(D)	−0.97**	<0.0001	0.21**	<0.0001
Univariate regression†
Gender(female = 2)	0.02	0.2662	0.03	0.8288
Change of height (mm)	0.05**	<0.0001	0.03**	<0.0001
Change of weight (kg)	0.11**	<0.0001	0.04**	<0.0001
Outdoor time (hour)	−0.01	0.7290	0.01	0.8686
Near work time (hour)	0.03	0.0535	0.11*	0.0198
Paternal refraction (D)	−0.04*	0.0244	−0.06*	0.0471
Maternal refraction (D)	−0.05*	0.0022	−0.06*	0.0122
Two myopic parents	0.05*	0.0183	0.43*	0.0187

*p < 0.05.

**p < 0.001.

^†Adjusting for baseline age and baseline refraction.