Exploratory and Confirmatory Factor Analyses of Delirium Symptoms in a Sample of Nursing Home Residents

Reliability and Validity of the Spanish Adaptation of the Stanford Proxy Test for Delirium in Two Clinical Spanish-Speaking Communities

BACKGROUND

Delirium is the most prevalent neuropsychiatric syndrome experienced by patients admitted to inpatient clinical units, occurring in at least 20% of medically hospitalized patients and up to 85% of those admitted to critical care units. Although current guidelines recommend the implementation of universal prevention strategies, the use of management strategies largely depends on constant surveillance and screening. This allows for the timely diagnosis and correction of its underlying causes and implementation of management strategies.

OBJECTIVE

It was to adapt and analyze the Spanish adaptation of the Stanford Proxy Test for Delirium (S-PTDsv) instrument for its use among Spanish-speaking populations. The S-PTD is an instrument consisting of 13 observational items to be completed by a clinician observer, usually the patient's nurse. The completion of the questionnaire takes about 1 minute and does not require the active participation of the person evaluated, which has important clinical advantages compared to other available instruments (e.g., the Confusion Assessment Method).

METHODS

The psychometric properties of the S-PTDsv were evaluated in a population of 123 patients using a quantitative, cross-sectional design. All subjects were over 18 years of age and hospitalized in various inpatient medico-surgical and intensive care unit services, either at the Barcelona Clinical Hospital (Barcelona, Spain) or the UC-Christus Health Network Clinical Hospital (Santiago, Chile, S.A.). The ultimate diagnosis of delirium was made by a member of the Psychiatry Consult Service by means of an independent neuropsychiatric evaluation based on the Fifth Edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) criteria, published in 2013, which is the latest version of the diagnostic manual. All study tests were performed by study personnel who were blinded to each other's test results within an hour of each other.

RESULTS

In the receiver operator characteristic (ROC) curve analysis, the S-PTDsv demonstrated excellent classification qualities when compared with the DSM-5 as the classification reference standard. Using a cutoff point of ≥3, the S-PTDsv had a sensitivity of 94% and a specificity of 97%. The area under the curve indicator was equal to 0.95, suggesting the S-PTDsv has an excellent overall performance in accurately identifying cases of delirium. Accordingly, the S-PTDsv's positive predictive value = 0.93, and the negative predictive value = 0.97. The internal reliability measured with Cronbach's alpha was 0.96. Confirmatory factor analysis revealed a 1-dimensional structure with high loadings (>0.72), demonstrating that all items similarly contribute to the total diagnostic dimension, suggesting adequate construct validity. This provided evidence of convergent validity.

CONCLUSIONS

The performance of the S-PTDsv, as compared to a blinded neuropsychiatric assessment based on DSM-5, indicates that it is an effective instrument for the detection of delirium, in the Spanish-speaking populations. These results are comparable and consistent with previously published studies in the English language version.

Increasing the Power of Intergenerational Programs: Advancing an Evaluation Tool

Intergenerational practitioners responding to a 2018 national survey identified a need for evidence-informed evaluation tools to measure program impact. The Best Practices (BP) Checklist, a 14-item (yes/no) measure assessing the extent to which an intergenerational program session maintained effective intergenerational strategies, may help meet this need. Yet, researchers have not validated the measure. In this study, we begin the empirical validation process by completing an exploratory factor analysis (EFA) of the BP Checklist to offer insight into possible item reduction and an underlying latent factor structure. Using BP Checklist data from 132 intergenerational activities, we found a 13-item, 3-factor structure, reflecting dimensions of: (a) pairing intergenerational participants, (b) person-centered strategies (e.g., selecting activities reflecting participants’ interests), and (c) staff knowledge of participants. Our study represents a foundational step toward optimizing intergenerational program evaluation, thereby enhancing programming quality.

Patient Perception of Physicians and Medication Adherence Among Older Adults With Hypertension

Objective: To assess association between patient perception of physicians and adherence to antihypertensive medication among Medicare beneficiaries. Method: Logistic regression was used to assess association between the Patient Perception of Physicians Scale score and adherence to antihypertensive medication. The 2007 Medicare Current Beneficiary Survey data were used to create a 12-item patient perception of physician scale and 2008 Medicare Part D claims to assess adherence. Results: There were 2,510 beneficiaries included in the sample. The mean age was 76.4 years ( SD = ±6.88 years). Sixty-five percent of the sample was adherent in filling their antihypertensive medication. Beneficiaries with more favorable perceptions of their physician (scores 37 or higher) were more likely to be adherent to antihypertensive medications than beneficiaries with scores less than 37 (odds ratio [OR] = 1.341, 95% confidence interval [CI] = [1.101, 1.632], p = .0035). Discussion: These findings provide some evidence that patient perceptions of their physician are associated with adherence, and that the physician–patient relationship is an important factor.

Measuring State Medicaid Home Care Participation and Intensity Using Latent Variables

Population aging and policies to redirect long-term care toward home- and community-based services have led to increases in Medicaid home care spending in most states. Changes in state Medicaid home care policy generosity may result from changes in the number of persons served (i.e., Participation) and/or changes in quantities of services covered (i.e., Intensity). This study measures state Medicaid home care Participation and Intensity comprehensively using latent variables, and uses those latent variables to describe changes in Medicaid home care policy generosity over time and across states. Yearly state-level data from the Medicaid Statistical Information System (1999-2012) are analyzed using exploratory and confirmatory factor analyses. Between 1999 and 2012, 29 states expanded both Participation and Intensity, whereas six states reduced both. In the remaining states, a trade-off occurred. Distinguishing between Medicaid home care Participation and Intensity deserves attention, as expansions along these two dimensions represent potentially different implications for beneficiaries.