Table A1.

Standardized factor loadings from the exploratory factor analysis of the individual difference measures included in the composite measures.

	1	2	3	4
1. Reading GM	0.62	0.14	0.21	0.06
2. Reading PIAT	0.87	0.08	0.00	−0.14
3. Reading SDRT	0.42	0.05	0.11	0.52
4. Reading WJ	0.59	0.21	0.05	0.17
5. Listening PIAT	0.87	−0.03	−0.09	−0.04
6. Listening WJ	0.78	−0.19	0.18	0.16
7. Vocab PPVT	0.83	0.03	−0.04	0.16
8. Vocab WASI	0.69	0.06	−0.01	0.20
9. Decoding W TOWRE	0.05	0.57	0.29	0.20
10. Decoding W WJ	0.31	0.61	0.00	0.15
11. Decoding NW TOWRE	−0.05	0.83	0.15	0.07
12. Decoding NW WJ	0.03	0.89	−0.01	−0.09
13. Fluency GORT	0.14	0.62	0.05	0.22
14. Fluency WJ	0.23	0.20	0.16	0.48
15. RAN colors	0.05	−0.10	0.73	−0.16
16. RAN digits	0.01	0.18	0.76	0.05
17. RAN letters	−0.03	0.04	0.89	0.02
18. Phonological awareness	0.60	0.30	0.01	−0.15
19. Phonological memory	0.45	0.25	−0.03	−0.20
20. Print authors	0.06	0.08	0.03	0.76
21. Print magazines	0.02	0.10	−0.26	0.58