Table 6.
Fit statistics and correlations for structural equation models including working memory capacity or executive function as mediators of the relation between age and episodic memory. EM: Episodic Memory; WMC: Working Memory Capacity; EF: Executive Function; EA: Executive Attention; PS: Processing Speed
| Model | Correlation | χ2 | df | CFI | RMSEA |
|---|---|---|---|---|---|
| Age Effect Model | 1.0 | 2 | 1.0 | 0.00 | |
| Age → EM | -.41 | ||||
| Model A1 | 41.8 | 18 | .95 | .081 | |
| Age → WMC | -.58 | ||||
| Age → EM | .01 | ||||
| WMC → EM | .73 | ||||
| Model A2 | 90.4 | 18 | .83 | .141 | |
| Age → EF | -.54 | ||||
| Age → EM | -.01 | ||||
| EF → EM | .73 | ||||
| Model A3 | 168.4 | 52 | .86 | .106 | |
| Age → EA | -.61 | ||||
| Age → EM | .05 | ||||
| EA → EM | .77 | ||||
| Model B1 | 70.8 | 41 | .97 | .062 | |
| Age → PS | -.81 | ||||
| PS → WMC | .75 | ||||
| PS → EM | -.08 | ||||
| Age → EM | -.04 | ||||
| WMC → EM | .78 | ||||
| Model B2 | 135.3 | 50 | .92 | .092 | |
| Age → PS | -.81 | ||||
| PS → EF | .78 | ||||
| PS → EM | -.25 | ||||
| Age → EM | -.08 | ||||
| EF → EM | .90 | ||||
| Model B3 | 212.6 | .86 | .91 | .086 | |
| Age → PS | -.81 | ||||
| PS → EA | .78 | ||||
| PS → EM | -.19 | ||||
| Age → EM | -.04 | ||||
| EA → EM | .86 |