Table 2.

Correlations Among Study Variables

Variable	M	SD	1	2	3	4	5	6	7
1. Age	64.57	9.92	—
2. Education level	2.53	1.51	−.25	—
3. Subjective reading	3.65	1.13	−.23	.43	—
4. Subjective writing	3.49	1.18	−.25	.45	.85	—
5. Verbal recall	3.33	1.98	−.37	.32	.33	.34	—
6. Word fluency	18.72	7.09	−.30	.38	.40	.40	.43	—
7. Arithmetic ability	1.57	.83	−.23	.42	.35	.36	.34	.38	—
8. Sex	54%a		.01	−.10	−.02	−.01	.06	−.04	−.19
9. Household income	41,392	49,774	−.11	.20	.14	.14	.12	.16	.13
10. Medical conditions	1.53	1.44	.31	−.16	−.19	−.20	−.18	−.16	−.16
11. ADL	.17	.69	.21	−.10	−.19	−.21	−.16	−.18	−.13
12. Reading eyesight	3.25	1.14	−.14	.17	.35	.33	.16	.19	.16
13. Country	45%b		.00	.25	.11	.10	.06	.14	.10

Notes. N = 28,535. ADL = activities of daily living. Correlations stronger than |.01| are significant at the .001 level. Point biserial correlations were calculated for dichotomous variables.

^aPercent women.

^bPercent countries with mean education level above the entire sample's median.