Table 2. Factor analysis results for composite cognitive domain variables.
| Cognitive domain | Initial eigenvalue | Variable | N | Mean | s.d. | Loading |
|---|---|---|---|---|---|---|
| Episodic memory | 2.50 (62.46%) | RAVLT 1-5 total | 407 | 52.96 | 8.92 | 0.76 |
| LM I immediate recall total | 407 | 48.43 | 8.07 | 0.89 | ||
| LM II delayed recall total | 407 | 30.29 | 6.28 | 0.86 | ||
| PAL first trial memory score | 407 | 18.35 | 3.46 | 0.63 | ||
| Working memory | 2.04 (50.93%) | Digit span | 407 | 18.63 | 3.90 | 0.76 |
| Letter–number sequencing | 407 | 11.59 | 2.40 | 0.79 | ||
| SWM between errors | 407 | 25.36 | 18.64 | −0.63 | ||
| SSP length | 407 | 5.75 | 1.20 | 0.66 | ||
| Executive function | 1.80 (59.83%) | Stroop trial C | 403 | 26.26 | 7.63 | 0.76 |
| RVP A′ | 403 | 0.91 | 0.05 | −0.81 | ||
| TMT trial B | 403 | 59.09 | 18.82 | 0.75 | ||
| Language processing | 1.88 (62.81%) | WAIS vocabulary | 421 | 56.62 | 6.23 | 0.88 |
| WAIS comprehension | 421 | 26.21 | 3.33 | 0.77 | ||
| Boston naming test | 421 | 57.49 | 3.42 | 0.72 |
Abbreviations: LM, logical memory; RAVLT, Rey auditory verbal learning test; RVP, rapid visual processing; SSP, spatial span; SWM, spatial working memory; TMT, trail making test; WAIS, Wechsler Adult Intelligence Scale.
Note: data in parentheses represent the proportion of variance (%) explained by the resulting factor.