Table 6.

Multilevel models to test Hypotheses 5 and 6

Predictors	Episodic memory			Executive functioning			BTACT composite
Predictors	Estimates	95% CI	P	Estimates	95% CI	p	Estimates	95% CI	p
Intercept (M2)	−0.40	−0.57 to −0.22	<0.001	−0.03	−0.16 to 0.09	0.596	−0.09	−0.21 to 0.03	0.146
MIDUS wave	−0.13	−0.25 to 0.00	0.052	−0.43	−0.51 to −0.36	<0.001	−0.38	−0.45 to −0.31	<0.001
IAPF	0.12	−0.00 to 0.25	0.055	0.07	−0.02 to 0.16	0.115	0.08	−0.00 to 0.16	0.058
Sex	0.68	0.47 to 0.89	<0.001	0.06	−0.10 to 0.21	0.469	0.16	0.02 to 0.31	0.030
Education	0.17	0.05 to 0.30	0.007	0.14	0.05 to 0.22	0.002	0.13	0.05 to 0.21	0.001
Lag between waves	−0.06	−0.17 to 0.06	0.326	−0.17	−0.26 to −0.09	<0.001	−0.16	−0.24 to −0.08	<0.001
Wave × IAPF	0.07	−0.06 to 0.20	0.281	0.07	−0.00 to 0.15	0.061	0.07	0.00 to 0.14	0.047
Random effects
σ²	0.47			0.15			0.13
τ₀₀	0.42 _M2ID			0.28 _M2ID			0.25 _M2ID
ICC	0.47			0.64			0.65
N	234 _M2ID			235 _M2ID			234 _M2ID
Observations	451			458			443
Marginal R²/conditional R²	0.156/0.553			0.188/0.711			0.196/0.715

Repeated measured cognitive data nested within participant, indicated by M2ID. Sex coded as 0 = male, 1 = female. Education coded as −1 = high school or less, 0 = some college, 1 = bachelor's degree or higher. MIDUS wave coded as 0 = MIDUS 2, 1 = MIDUS 3. Years between waves (i.e., between MIDUS 2 and MIDUS 3 Cognitive Projects) and age at M2 Neuroscience Project are mean centered. Empirical Bayes slope estimation used (Bates et al., 2015).
Bold values are significant at p < .05.