Table 3.

Associations Between Educational Achievement and Both Waking Ln-Cortisol and 24-hr Ln-Salivary Cortisol Trajectories From Random Effects Models, Baltimore Memory Study

	Model 1a (n = 566)		Model 2b (n = 566)		Model 3c (n = 549)
	Coefficient	p Value	Coefficient	p Value	Coefficient	p Value
Time (30min)	−.02	<.001*	−.02	<.001*	−.04	<.001*
Time2	−.00	<.001*	−.00	<.001*	−.00	<.001*
Time3	.00	<.001*	.00	<.001*	.00	<.001*
Intermediate education vs. highd	−.17	.009*	−.09	.214	−.05	.438
Low education vs. highd	−.11	.089	−.05	.452	−.04	.571
Intermediate education × time	.01	.016*	.00	.439	.00	.832
Low education × time	.00	.310	−.00	.920	−.00	.551
AA race/ethnicity			−.21	<.001*	−.21	.001*
AA race/ethnicity × time			.01	<.001*	.01	<.001*

Notes: All models included random intercept, and fixed and random effects for time and time² and fixed effect for time³ and used an unstructured covariance matrix and a first-order autoregressive error structure.

*p < .05.

^aModel adjusted for the fixed effects of educational level, mean-centered age, sex, and their statistically significant interactions with time and time polynomials.

^bModel additionally adjusted for the fixed effects of race/ethnicity and its interaction with time.

^cModel additionally adjusted for the fixed effects of the stressful life event index, cigarette use, awakening time, body mass index and its interaction with time, and medical conditions.

^dCategorized as high (≥college), intermediate (some college), or low (≤high school).