Table 2.

Bivariate correlations between participant characteristics, retinal morphology, and intellectual ability.

			1	2	3	4	5	6	7	8	9	10	11
1.	Age	r
		p
2.	Sex	r	0.06
		p	0.69
3.	Education	r	-0.13	0.01
		p	0.34	0.96
4.	% Fat	r	-0.04	-0.76**	-0.06
		p	0.79	<0.01	0.68
5.	Macular volume	r	0.14	0.34*	0.03	-0.27*
		p	0.32	0.01	0.81	0.05
6.	RNFL volume	r	0.19	0.35*	0.24†	-0.16	0.49**
		p	0.17	0.01	0.09	0.24	<0.01
7.	GCL volume	r	0.16	0.21	0.03	0.01	0.73**	0.56**
		p	0.24	0.13	0.85	0.95	<0.01	<0.01
8.	Center foveal thickness	r	0.29*	0.25†	-0.14	-0.14	0.39**	0.24	0.28*
		p	0.03	0.07	0.33	0.32	<0.01	0.09	0.04
9.	Intelligence quotient	r	-0.05	0.34*	0.10	-0.25†	0.23†	0.462**	0.32*	0.27*
		p	0.74	0.01	0.45	0.07	0.09	<0.01	0.02	0.05
10.	Crystallized intelligence	r	-0.01	0.23	0.08	-0.15	0.31*	0.40**	0.43**	0.29*	0.89**
		p	0.97	0.10	0.57	0.27	0.02	<0.01	<0.01	0.04	<0.01
11.	Fluid intelligence	r	-0.03	0.39**	0.11	-0.31*	0.08	0.42**	0.10	0.18	0.81**	0.45**
		p	0.84	<0.01	0.43	0.02	0.59	<0.01	0.49	0.19	<0.01	<0.01

^†p < 0.10; ^∗p < 0.05; ^∗∗p < 0.01. RNFL, retinal nerve fiber layer; GCL, ganglion cell layer.