Table 2.

Fit Statistics for CFA models of cognitive ability and family SES

	Fit indices				Unstandardized parameter estimates (p)
Model	χ2 (df)	P	RMSE A [95% CI]	AIC
Cognitive ability					Test 1	Test 2	Test 3	Test 4
Cohort 2	6.396 (2)	.041	.033 [.006; .063]	35992.773	1.539 (.000)	1.548 (.000)	2.137 (.000)	0.919 (.000)
Cohort 3	7.854 (2)	.020	.037 [.013; .066]	35793.681	1.605 (.000)	1.570 (.000)	1.895 (.000)	1.431 (.000)
Cohort 4	2.799 (2)	.247	.014 [.000; .050]	33455.941	1.787 (.000)	1.857 (.000)	1.963 (.000)	1.470 (.000)
Socioecomic status					ISCED	ISEI	EGP	Income
Cohort 2	15.288 (2)	.000	.057 [.003; .085]	19113.147	.708 (.000)	.945 (.000)	.719 (.000)	.612 (.000)
Cohort 3	48.292 (2)	.000	.104 [.070; .131]	19359.299	.652 (.000)	.983 (.000)	.700 (.000)	.514 (.000)
Cohort 4	66.037 (2)	.000	.063 [.051; .077]	74495.052	.673 (.000)	.967 (.000)	.719 (.000)	.504 (.000)