Table 8.

Multilevel models to test Hypotheses 7b and 7d

Predictors	Episodic memory			Executive functioning			BTACT
	Estimates	95% CI	p	Estimates	95% CI	p	Estimates	95% CI	p
Intercept (M2)	−0.42	−0.59 to −0.24	<0.001	−0.06	−0.18 to 0.06	0.360	−0.11	−0.22 to 0.00	0.052
MIDUS wave	−0.13	−0.26 to 0.00	0.057	−0.44	−0.52 to −0.36	<0.001	−0.39	−0.46 to −0.32	<0.001
IAPF	0.08	−0.05 to 0.21	0.225	0.01	−0.07 to 0.10	0.797	0.02	−0.06 to 0.10	0.610
Age	−0.02	−0.03 to −0.01	0.005	−0.02	−0.03 to −0.02	<0.001	−0.02	−0.03 to −0.02	<0.001
Sex	0.72	0.51 to 0.93	<0.001	0.11	−0.04 to 0.25	0.145	0.21	0.08 to 0.35	0.002
Education	0.17	0.04 to 0.29	0.009	0.14	0.06 to 0.22	0.001	0.14	0.06 to 0.21	<0.001
Lag between waves	−0.09	−0.20 to 0.02	0.116	−0.21	−0.29 to −0.13	<0.001	−0.19	−0.26 to −0.12	<0.001
Wave × IAPF	0.05	−0.09 to 0.18	0.483	0.07	−0.01 to 0.15	0.071	0.07	−0.01 to 0.14	0.076
Wave × age	−0.01	−0.02 to 0.00	0.165	0.00	−0.01 to 0.01	0.741	−0.00	−0.01 to 0.01	0.994
IAPF × age	0.00	−0.01 to 0.01	0.836	0.00	−0.00 to 0.01	0.350	0.00	−0.00 to 0.01	0.374
Wave × IAPF × age	0.00	−0.01 to 0.01	0.896	−0.00	−0.01 to 0.00	0.301	−0.00	−0.01 to 0.00	0.379
Random effects
σ 2	0.47			0.15			0.14
τ 00	0.38 M2ID			0.22 M2ID			0.19 M2ID
ICC	0.45			0.59			0.58
N	234 M2ID			235 M2ID			234 M2ID
Observations	451			458			443
Marginal R2/conditional R2	0.203/0.559			0.298/0.713			0.318/0.715

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.