Table 1.
Outcome Measures | Instrument | Psychometric Properties of Instrument | Number of Items | Total Score RangeA | Subscale Score RangeA | |
---|---|---|---|---|---|---|
PWD specific outcomes | Cognitive function | MoCA | Cronbach’s α range: 0.83 Test-retest reliability: r = 0.92 Construct validity established through CFA (Freitas et al., 2012; Nasreddine et al., 2005) |
16 | 0–30 | N/A |
BPSD | ||||||
Global BPSD | NPI | Cronbach’s α range: 0.71–0.88 Percentage agreement between raters: 93.6%–100% Test-retest reliability range (r): 0.79–0.86 (Jackson et al., 2014; Lai, 2014) |
12 | 0–144 | CG Distress Subscale: 0–60 | |
Agitation | CMAI-Relatives version | Cronbach’s α range: 0.860.91 Inter-rater reliability: 0.41 Construct validity established through CFA (Cohen-Mansfield et al., 1989; Rabinowitz et al., 2005) |
34 | 34–238 | N/A | |
Anxiety | RAID * | Cronbach’s α: 0.83 Inter-rater reliability k range: 0.51–1 Test-retest reliability k range: 0.53–1 Construct validity established through CFA (Shankar et al., 1999) |
18 | 0–54 | N/A | |
Sleep disturbances | NPI-Sleep Domain | See NPI instrument above | 18 | 1–12 | Frequency subscale: 1–4 Severity subscale: 1–3 CG distress subscale: 0–5 |
|
PSQI | Cronbach’s α: 0.85 Test-retest reliability: r = 0.87 (Backhaus et al., 2002) |
9 | 0–21 | N/A | ||
ESS | Cronbach’s α: 0.73–0.86 Convergent validity established by comparing ESS with PSQI scores (Kendzerska et al., 2014) |
8 | 0–24 | N/A | ||
Quality of life | QOL-AD* |
PWD report Cronbach’s α: 0.83 CG Proxy Report Cronbach’s α: 0.90 ICC between CR and proxy CG proxy report: r = 0.14–0.39 Construct validity established through CFA (Logsdon et al., 1999; Thorgrimsen et al., 2003) |
13 | 13–52 | N/A | |
CG specific outcomes | Well-being | CWBS | Cronbach’s α: 0.83 Construct validity established through CFA (Berg-Weger et al., 2000; Tebb et al., 2013) |
16 | 1–5 | Basic needs subscale: 1–5 ADL subscale: 1–5 |
Self-reported health status | SF-12 | Cronbach’s α range 0.76–0.85 Test-retest reliability range: 0.76–0.89 Construct validity established through CFA (Jakobsson, 2007) |
12 | 0–100 | Physical health composite subscale: 0–100 Mental health composite subscale: 0–100 |
Note. ADL activities of daily living, BPSD, behavioral and psychological symptoms of dementia, CFA confirmatory factor analysis, CG caregiver, CMAI Cohen-Mansfield Agitation Inventory-Relatives version, CWBS Caregiver Well-Being Scale, ESS Epworth Sleepiness Scale, MoCA Montreal Cognitive Assessment Test, NPI Neuropsychiatric Inventory, PWD person with dementia, RAID Rating Anxiety in Dementia Scale, SF-12 Optum SF-12v.2 Health Survey
The RAID and QOL-AD are completed independently by self-report by the person living with dementia, and by proxy report by the caregiver to yield a person with dementia reported total score, and a caregiver reported total score.
- MoCA: Higher scores indicate better cognitive function. ≤9 indicative of moderate dementia, ≤17 indicative of mild dementia, ≤23 indicative of mild cognitive impairment, ≤30 normal cognitive function
- NPI: Higher scores indicative of greater frequency and severity of neuropsychiatric symptoms. Higher caregiver distress scores indicate of greater caregiver distress related to neuropsychiatric symptoms.
- CMAI: Higher scores indicative of greater agitation severity. Score of ≥ 39 suggest clinically significant agitation.
- RAID: Higher scores indicative of greater anxiety. Score of ≥ 11 suggests clinically significant anxiety.
- PSQI: Higher total scores indicative of overall worse sleep quality. Score of ≥ 5 suggests clinically significant sleep disturbances.
- ESS: Higher scores indicate more severe daytime sleepiness.
- QOL-AD: Higher scores are reflective of higher reported quality of life.
- CWBS: Higher total scores indicate greater reported well-being. Higher needs and activities of daily living domain scores indicate that the needs and activities are being met.