Table 6. Correlation between Refractive Sphere, Age, or Vessel Diameter, and Oxygen Saturation in the Major Retinal Vessels.

	Pearson’s correlation		Stepwise forward regression
	r	p-value	Standardized β	p-value
Artery
Refractive sphere	0.01	0.934	-	-
Age	0.18	0.004	0.026	0.002
Vessel diameter	-0.15	0.021	-0.16	0.013
Vein
Refractive sphere	-0.05	0.436	-	-
Age	-0.06	0.366	-	-
Vessel diameter	-0.02	0.702	-	-
A-V difference
Refractive sphere	0.05	0.435	-	-
Age	0.19	0.003	0.19	0.003

Adjusted R² (the coefficient of multiple determination) = 0.049 (artery), 0.032 (A-V difference).

r = Pearson’s correlation coefficient; β = regression coefficient.