Investment Trait, Activity Engagement, and Age: Independent Effects on Cognitive Ability

Table 3

Standardized regression parameters for two-way and three-way moderation models.

Step	Model 1						Model 2						Model 3
	Fluid ability			Crystallized ability			Fluid ability			Crystallized ability			Fluid ability			Crystallized ability
	𝛽	CI (95%)		𝛽	CI (95%)		𝛽	CI (95%)		𝛽	CI (95%)		𝛽	CI (95%)		𝛽	CI (95%)
1
Age	−.14	−0.63	−0.01	.17	0.08	0.77	−.11	−0.59	0.07	.19	0.12	0.86	−.13	−0.63	0.03	.19	0.12	0.86
NFC	.34	0.44	1.05	.35	0.51	1.16	—	—	—	—	—	—	.32	0.39	1.02	.35	0.50	1.18
CAE	—	—	—	—	—	—	.07	−0.18	0.48	.09	−0.13	0.59	.03	−0.27	0.38	.05	−0.22	0.48
2
NFC×age	−.03	−0.37	0.24	−.04	−0.41	0.24	—	—	—	—	—	—	−.05	−0.43	0.23	−.01	−0.38	0.32
CAE×age	—	—	—	—	—	—	−.05	−0.43	0.20	−.05	−0.45	0.24	−.05	−0.46	0.23	.01	−0.36	0.39
CAE×NFC	—	—	—	—	—	—	—	—	—	—	—	—	−.09	−0.43	0.10	.00	−0.28	0.29
3
CAE×NFC×age	—	—	—	—	—	—	—	—	—	—	—	—	.09	−0.13	0.36	.13	−0.07	0.45

Note: the regressions were stepwise conducted, entering the respective set of independent variables in step 1, and their corresponding interaction terms in step 2 and 3. All models were run separately for fluid and crystallized ability as dependent variables. Model 1 shows the results for the two-way interaction of age and need for cognition; model 2 shows the two-way interaction of age and cognitive activity engagement; model 3 shows the results of testing for the three-way interaction. Significant parameters are shown in bold. Keys: age = age in years; NFC = need for cognition; CAE = cognitive activity engagement.