Table 4.
Factor structure representing the relationships between behavioural and psychological symptoms by cognitive classification.
| MMSE groups | Factor 1 | Factor 2 | Factor 3 | Factor 4 |
| MMSE 18-21 | mis/hal/wan/ela | apa/mis/anx/dep | per/irr | |
| MMSE 22-25 | mis/hal | apa/anx/dep | per/irr | |
| MMSE 26-30 | mis/hal | anx/dep/(apa) | per/wan/irr | |
| MCI classification | ||||
| Normal | mis/hal | anx/dep | per/wan/irr | |
| MCI | mis/hal | apa/anx/dep/sle | per/wan/ela/irr | |
| OCIND | mis/hal | apa/anx/dep | per/irr | wan/(ela) |
| MCI Subtypes | ||||
| A-MCI | mis/hal | apa/anx/dep/sle | per/wan/ela/irr | agi/irr |
| N-MCI | mis/hal/anx/dep | apa/sle | per/irr | ela/agi |
| M-MCI | mis/hal/wan/ela | apa/anx/dep | irr/(per) | |
| Dementia (adapted from Savva et al 2009 [4]) | mis/hal/con/apa/per/wan | anx/dep/hal | irr/per/agi | agi/ela/hal/sle/wan |
Symptoms are included in each factor if their factor loading is >0.3 (symptoms loading >0.25 but <0.3 are shown in brackets). Key to symptoms: mis = misidentification, hal = hallucinations, wan = wandering, ela = elation, apa = apathy, anx = anxiety, dep = depression, per = feeling of persecution, irr = irritability, agi = agitated behaviour, sle = sleep problems.