Table 3: Standardized regression parameters for two-way and three-way moderation models.

StepModel 1Model 2Model 3
Fluid ability Crystallized ability Fluid ability Crystallized abilityFluid abilityCrystallized ability
𝛽 CI (95%) 𝛽 CI (95%) 𝛽 CI (95%) 𝛽 CI (95%) 𝛽 CI (95%) 𝛽 CI (95%)

1
 Age−.14−0.63−0.01.170.080.77−.11−0.590.07.190.120.86−.13−0.630.03.190.120.86
 NFC.340.441.05.350.511.16.320.391.02.350.501.18
 CAE.07−0.180.48.09−0.130.59.03−0.270.38.05−0.220.48
2
N F C × a g e −.03−0.370.24−.04−0.410.24−.05−0.430.23−.01−0.380.32
C A E × a g e −.05−0.430.20−.05−0.450.24−.05−0.460.23.01−0.360.39
C A E × N F C −.09−0.430.10.00−0.280.29
3
C A E × N F C × a g e .09−0.130.36.13−0.070.45

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.