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 CI (95%) CI (95%) CI (95%) CI (95%) CI (95%) 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   −.03 −0.37 0.24 −.04 −0.41 0.24 — — — — — — −.05 −0.43 0.23 −.01 −0.38 0.32   — — — — — — −.05 −0.43 0.20 −.05 −0.45 0.24 −.05 −0.46 0.23 .01 −0.36 0.39   — — — — — — — — — — — — −.09 −0.43 0.10 .00 −0.28 0.29 3   — — — — — — — — — — — — .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.