Table 3.
Exploratory factor analysis results on the NPI-Q rating scale domains in aMCI and patients with DAT.
| Domain | Factor 1 | Exploratory bifactor analysis | |
|---|---|---|---|
| General factor | Single-group factor | ||
| 1. Delusions | 0.707 | 0.473 | 0.652 |
| 2. Hallucinations | 0.481 | – | 0.731 |
| 3. Agitation/aggression | 0.391 | 0.325 | – |
| 4. Dysphoria/depression | 0.527 | 0.603 | – |
| 5. Anxiety | 0.668 | 0.923 | – |
| 6. Apathy/indifference | 0.810 | 0.687 | 0.402 |
| 7. Disinhibition | 0.539 | 0.446 | – |
| 8. Irritability | 0.752 | 0.791 | – |
| 9. Aberrant motor | 0.554 | 0.539 | – |
| 10. Nighttime disturbances | 0.431 | 0.339 | – |
| 11. Appetite/eating disturbances | 0.829 | 0.6283 | 0.589 |
| Quality data | |||
| Kaiser-Meyer-Olkin | 0.76697 | 0.76697 | |
| Factor determinacy index | 0.950 | 0.965 | 0.904 |
| Marginal reliability | 0.831 | 0.930 | 0.817 |
| Sensitivity ratio | 2.218 | 3.654 | 2.115 |
| Expected percentage of true differences | 89.7% | 94.1% | 89.2% |
| Generalized H index | 0.832 | 0.930 | 0.817 |
| Root mean square of residuals (Kelley’s criterion) | 0.1226 (0.0917) | 0.0909 (0.0917) | |
Exploratory factor analysis (one factor and bifactorial solutions) performed on the 11 domains of the NPI-Q rating scale. Significant loadings are shown in bold. Loadings lower than 0.3 (non-significant loadings) are omitted. NPI-Q, Neuropsychiatric Inventory Questionnaire; aMCI, amnestic mild cognitive impairment; DAT, Dementia of Alzheimer’s Type.