Does self-care improve coping or does coping improve self-care? A structural equation modeling study.

BACKGROUND: Support interventions often address both self-care and coping. Different approaches are used to promote self-care and coping so clarifying the intervention effect can guide clinicians and researchers to provide interventions that achieve benefit. PURPOSE: To compare two models to determine whether self-care improves coping or coping improves self-care. METHODS: We used cross-sectional data from 248 caregivers obtained at enrollment into a randomized controlled trial testing the efficacy of a support intervention. Factor scores for scales measuring caregiver demand, self-care, coping, stress appraisal, and mental health were derived from exploratory factor analysis. Structural equation models were analyzed using the factor scores as estimates of each construct. To control possible spurious effects caregiver age, gender, relationship with the patient, and income adequacy were included. RESULTS: Both models were compatible with the data, but the self-care model was stronger than the coping model. That model had a non-significant chi square and an excellent fit to the data, χ2(4, N = 248) = 2.64, p = .62. The percentage of variance explained by the self-care model was 54 % for mental health, 42 % for stress appraisal, 10 % for avoidance coping, and 6 % for active coping. In the coping model the explained variance of stress appraisal dropped to 33 %, avoidance coping dropped to 0 %, and active coping dropped to 3 %. CONCLUSIONS: The self-care model was strongest, illustrating that self-care decreases stress, promotes coping, and improves mental health. These results suggest that promoting self-care may be more effective in improving mental health than interventions aimed at improving coping.

Psychometric Analysis of the Health Self-Care Neglect Scale.

OBJECTIVES: The Health Self-Care Neglect (HSCN) scale is a measure of self-care neglect developed for use in informal caregivers, where self-care is defined as behaviors undertaken to maintain health. There was no formal psychometric analysis of the scale, so we tested a 9-item, dichotomous-response version of the HSCN scale in a sample of 250 informal caregivers of adults with chronic heart failure. METHODS: As the indicators of self-care neglect were considered formative (influencing the latent variable directly) rather than reflective (influenced by the latent variable), we used a procedure for the specification of formative measurement models. First, maximally correlated composites of indicators were identified for the latent variable, and optimal scoring weights were developed. Then, the reflective factor was tested with confirmatory factor analysis, and longitudinal invariance of the factorial structure was tested by introducing model constraints. Reliability was assessed with composite reliability model-based estimates. Concurrent validity was assessed by correlating the HSCN scale total score with the maintenance scale score of the Self-Care Inventory. RESULTS: Strict invariance, the highest level possible, was achieved. Reliability was 0.81 at baseline. Concurrent validity was demonstrated (r = -0.475, P < .0001). CONCLUSION: The results of this analysis indicate that the HSCN scale is reliable, stable, and valid as a measure of health self-care neglect when tested in a sample of caregivers. The HSCN scale measures the successful performance of self-care, whereas existing measures of self-care reflect intention. Understanding both intention and behavior is useful, so we recommend using the HSCN scale in addition to existing measures of self-care.

The impact of emotional contagion on workplace safety: Investigating the roles of sleep, health, and production pressure.

Using emotional contagion theory and the Job Demands-Resources model as a theoretical foundation, we tested the proposition that higher levels of contagion of anger (i.e., a demand) vs. higher levels of contagion of joy (i.e., a resource) will be associated respectively with more vs. fewer sleep disturbances and health problems, which in turn are related to more workplace accidents and injuries. Moreover, we examined the moderating impact of production pressure (i.e., a contextual demand) on the relationship between emotional contagion and employee poor sleep and health. Data from 1000 employees in Italy showed that the conditional indirect effects of contagion of anger, but not of joy, on accidents and injuries via sleep and health problems were intensified as levels of production pressure increased. Furthermore, contagion of anger was positively associated with both sleep disturbances and health problems whereas contagion of joy was negatively related to only sleep disturbances. These findings suggest that the effect of anger that employees absorb during social interactions at work likely persists when coming at home and represents an emotional demand that impairs the physiological functions that regulate restorative sleep and energies recharging; and, this effect is even stronger among employees who perceived higher levels of organizational production pressure.

Further Evidence of Psychometric Performance of the Self-care of Diabetes Inventory in Adults With Type 1 and Type 2 Diabetes.

BACKGROUND: The Self-care of Diabetes Inventory (SCODI) is a theory-based tool that measures self-care, a key strategy in the appropriate treatment of diabetes. However, despite the clinical differences between people with Type 1 Diabetes Mellitus (T1DM) and Type 2 Diabetes Mellitus (T2DM), the psychometric properties of the SCODI were only tested in mixed samples. PURPOSE: This study aims to test the psychometric performances of the SCODI in two separate groups of adults with T1DM and T2DM. METHODS: This is a secondary analysis from two previous multicentre cross-sectional observational studies involving patients with T1DM (n = 181) and T2DM (n = 540). We tested dimensionality with confirmatory factor analysis and reliability with a multidimensional model-based coefficient for every scale of the SCODI: self-care maintenance, self-care monitoring, self-care management, and self-care self-efficacy. RESULTS: We found that the SCODI showed the same dimensionality, with minimal variation in factor loadings for each factor and each scale among T1DM and T2DM groups. High reliability for each scale in both groups was also found (self-care maintenance: T1DM = 0.86, T2DM = 0.83; self-care monitoring: T1DM = 0.84, T2DM = 1.00; self-care management: T1DM = 0.87, T2DM = 0.86; self-care self-efficacy: T1DM = 0.88; T2DM = 0.86). CONCLUSION: The SCODI can be used for measuring self-care in people with T1DM, T2DM, or mixed groups using identical scoring procedures. Considering the well-known differences between Type 1 and Type 2 diabetes diseases and patients' characteristics, our results support the generalizability of the self-care theory on which the instrument is based.

Measuring self-care in the general adult population: development and psychometric testing of the Self-Care Inventory.

BACKGROUND: Self-care is important at all stages of life and health status to promote well-being, prevent disease, and improve health outcomes. Currently, there is a need to better conceptualize self-care in the general adult population and provide an instrument to measure self-care in this group. Therefore, the aim of this study was to develop and evaluate the Self-Care Inventory (SCI), a theory-based instrument to measure self-care in the general adult population. METHODS: Based on the Middle Range Theory of Self-Care, the 20-item SCI was developed with three scales: Self-Care Maintenance (8 items), Self-Care Monitoring (6 items), and Self-Care Management (6 items). A cross sectional study with a US-based sample (n = 294) was conducted to test the SCI. Internal validity was assessed with Confirmatory Factor Analysis. Internal consistency reliability was assessed with Cronbach alpha for unidimensional scales or composite reliability and the global reliability index for multidimensional scales. Construct validity was investigated with Pearson correlation to test the relationship between general self-efficacy, positivity, stress, and self-care scores. RESULTS: The Self-Care Maintenance and Management scales were multidimensional and the Self-Care Monitoring scale was unidimensional. The global reliability index for multidimensional scales was 0.85 (self-care maintenance) and 0.88 (self-care management). Cronbach alpha coefficient of the self-care monitoring scale was 0.88. Test-retest reliability was 0.81 (self-care maintenance), 0.91 (self-care monitoring), and 0.76 (self-care management). The General Self-Efficacy Scale was positively related to all three self-care scale scores: self-care maintenance r = 0.46, p < 0. 001, self-care monitoring r = 0.31, p < 0. 001, and self-care management r = 0.32, p < 0. 001. The positivity score was positively related to self-care maintenance (r = 0.42, p < 0. 001), self-care monitoring (r = 0.29, p < 0. 001), and self-care management (r = 0.34, p < 0. 001) scores. The perceived stress was positively related to the self-care management (r = 0.20, p < 0. 001) score. CONCLUSIONS: The SCI is a theoretically based instrument designed to measure self-care in the general adult population. Preliminary evidence of validity and reliability supports its use in the general adult population.

The Influence of Preparedness, Mutuality, and Self-efficacy on Home Care Workers' Contribution to Self-care in Heart Failure: A Structural Equation Modeling Analysis.

BACKGROUND: Home care workers (HCWs) are increasingly caring for patients with heart failure (HF). Previous studies have shown that they contribute to HF patients' care, but how their preparedness and their relationship with patients (mutuality) influence caregiving is unknown, as well as the role of HCWs' self-efficacy. OBJECTIVE: Guided by the Situation-Specific Theory of Caregiver Contribution to HF Self-Care, we investigated the influence of HCWs' preparedness and mutuality on HCWs' contribution to HF self-care and the mediating effect of HCWs' self-efficacy in the process. METHODS: We conducted a cross-sectional survey of HCWs who cared for patients with HF. The survey included the Caregiver Preparedness Scale, Mutuality Scale, Caregiver Contribution to Self-Care of HF Index, and Caregiver Self-Efficacy in Contributing to Self-Care Scale. We performed structural equation modeling and a mediation analysis. RESULTS: A total of 317 HCWs employed by 22 unique home care agencies across New York, NY, completed the survey. They had a median age of 50 years, 94% were women, and 44% were non-Hispanic Black. Results demonstrated that mutuality had a direct influence on HCW contribution to self-care and preparedness influenced their contribution to self-care, but only through the mediation of self-efficacy. CONCLUSION: Home care workers' preparedness, mutuality, and self-efficacy have important roles in influencing their contribution to HF self-care. As a workforce increasingly involved in the care of patients with HF, knowing the mechanisms underpinning HCWs' contribution to self-care may illuminate future interventions aimed at improving their contributions and HF patient outcomes.

Italian adaptation of the Düsseldorf Orthorexia Scale (I-DOS): psychometric properties and prevalence of orthorexia nervosa among an Italian sample.

PURPOSE: Orthorexia Nervosa (ON) is described as an extreme level of preoccupation around healthy eating, accompanied by restrictive eating behaviors. During the years, different assessment instruments have been developed. The aim of the study is to adapt into Italian the Düsseldorf Orthorexia Scale (I-DOS) and to test its psychometric properties. METHOD: A total sample of 422 volunteer university students (mean age = 20.70 ± 3.44, women 71.8%) completed a group of self-report questionnaires in large group sessions during their lecture time. The scales assessed ON (the I-DOS and the Orhto-15), disordered eating (Disordered Eating Questionnaire, DEQ), depressive symptoms (Beck Depression Inventory-II, BDI-II), obsessive and compulsive symptoms (Obsessive Compulsive Inventory-Revised, OCI-R), and self-reported height and weight. RESULTS: The fit of the unidimensional structure and reliability of the I-DOS was tested trough Confirmatory Factor Analysis (CFA) as well as its criterion validity computing correlation coefficients among Ortho-15, DEQ, BDI-II, OCI-R, BMI. Analyses confirmed the unidimensional structure of the I-DOS with acceptable or great fit indices (CFI = 0.984; TLI = 0.978; SRMR = 0.043; RMSEA = 0.076) and the strong internal consistency (α = 0.888). The correlations path supported the criterion validity of the scale. The estimated total prevalence of both ON and ON risk was 8.1%. CONCLUSIONS: This 10-item scale appears to be a valid and reliable measure to assess orthorexic behaviors and attitudes. LEVEL OF EVIDENCE: Level V, descriptive cross-sectional study.

Cross-cultural applicability of the Self-Care Self-Efficacy Scale in a multi-national study.

AIM: The Self-Care Self-Efficacy Scale (SCSES) was newly developed as a self-report measure for self-care self-efficacy for chronic illness. This study investigated its measurement equivalence (ME) in different cultural groups, including United States, China (Hong Kong), Italy, and Brazil. DESIGN: A multi-national study for cross-cultural validation of the Scale. METHODS: From January 2015 - December 2018, investigators recruited 957 patients (United State: 200; Hong Kong: 300; Italy: 285; and Brazil: 142) with chronic illness from inpatient and outpatient settings. The SCSES was administered and clinical and demographic data were collected from participants. Based on the Meredith framework, multi-group confirmatory factor analysis evaluated the configural, metric, scalar, and strict invariance of the scale across the four populations through a series of nested models, with evaluation of reliability and coherence of the factor solution. RESULTS: The mean ages of the groups ranged from 65-77 years, 56.4% was male. The Cronbach's alpha coefficients of the single-factor SCSES were 0.93, 0.89, 0.92, and 0.90 for the United States, China (Hong Kong), Italy, and Brazil, respectively. Three of the four levels of ME were partially or totally supported. The highest level achieved was partial scalar invariance level (χ2 [52] = 313.4, p < 0.001; RMSEA = 0.067; 95% CI = 0.056-0.077; CFI = 0.966; TLI = 0.960, SRMR = 0.080). CONCLUSION: Patients from the four countries shared the same philosophical orientation towards scale items, although some of the items contributed differently to represent the concept and participants shared the same schemata for score interpretation. IMPACT: Self-efficacy is important in producing effective and sustainable self-care behavioural changes. Cultural ideation shapes the ways individuals interpret and report their self-care self-efficacy. The study findings support cross-cultural and cross-national utility of the SCSES for research on self-care across United States, China (Hong Kong), Italy, and Brazil.

Validity and Reliability of the Caregiver Contribution to Self-Care of Heart Failure Index Version 2.

BACKGROUND: Lay caregivers are important in contributing to self-care of patients with heart failure (HF). The Caregiver Contributions to Self-Care of Heart Failure Index (CC-SCHFI) measures these contributions, but after developing the Situation-Specific Theory of Caregiver Contributions to Heart Failure Self-Care, the CC-SCHFI needed updating to reflect the theory. OBJECTIVE: The aim of this study was to test the psychometric characteristics of the CC-SCHFI 2 that measures caregiver contributions (CC) to HF self-care with 3 scales: CC to self-care maintenance, CC to symptom perception, and CC to self-care management. METHODS: This is a cross-sectional study. We tested the CC-SCHFI 2 with confirmatory factor analysis, internal consistency, item-total correlations, and test-retest reliability. With the CC-SCHFI 2, we also administered the Self-Care of Heart Failure Index v.7.2 to patients and the Caregiver Contribution to Heart Failure Self-Care Scale to caregivers to assess concurrent validity. RESULTS: A sample of 277 caregivers was enrolled (mean [SD] age, 52.7 [14.9] years; 70.4% female). In confirmatory factor analysis, each CC-SCHFI 2 scale had supportive fit indices: comparative fit index ranged between 0.94 and 0.95, and root mean square error of approximation ranged between 0.05 and 0.07. Internal consistency of the 3 scales was evident with a Cronbach α between .81 and .83 and a global reliability index between 0.79 and 0.86. Item-total correlations were all greater than 0.30. In concurrent validity testing, there were significant correlations between the CC-SCHFI 2 and the Self-Care of Heart Failure Index v.7.2 and the Caregiver Contribution to Heart Failure Self-Care Scale. Test-retest reliability showed intraclass correlation coefficients between 0.72 and 0.91. CONCLUSIONS: Testing of the CC-SCHFI 2 supported validity and reliability, indicating that the instrument can be used in clinical practice and research to evaluate CC to the self-care of patients with HF.

The Self-Care of Heart Failure Index version 7.2: Further psychometric testing.

Clinicians and researchers need valid and reliable instruments to evaluate heart failure (HF) self-care. The Self-Care of Heart Failure Index (SCHFI) is a theoretically driven instrument developed for this purpose. The SCHFI measures self-care with three scales: self-care maintenance, measuring behaviors to maintain HF stability; symptom perception, measuring monitoring behaviors; and self-care management, assessing the response to symptoms. After the theory underpinning the SCHFI was updated, the instrument was updated to version 7.2 but it was only tested in the United States. In this study we tested the psychometric characteristics (structural and construct validity, internal consistency, and test-retest reliability) of the SCHFI v.7.2 in an Italian population of HF patients. We used a cross-sectional design to study 280 HF patients with additional data collected after 2 weeks for test-retest reliability. Adults with HF (mean age 75.6 (±10.8); 70.8% in New York Heart Association [NYHA] classes II and III) were enrolled from six centers across Italy. Confirmatory factor analysis showed supportive structural validity in the three SCHFI v.7.2 scales (CFI from 0.94 to 0.95; RMSEA from 0.05 to 0.07). Internal consistency reliability estimated with Cronbach's α and composite reliability ranged between .73 and .88; test-retest reliability ranged between 0.73 and 0.92. Construct validity was supported with significant correlations between the SCHFI v.7.2 scale scores and quality of life, brain natriuretic peptide levels and NYHA class. This study further supports the psychometric characteristics of the SCHFI v.7.2, illustrating that it can be used in clinical practice and research also in an Italian population.

Psychometric Testing of the Revised Self-Care of Heart Failure Index.

BACKGROUND: Self-care is essential in people with chronic heart failure (HF). The process of self-care was refined in the revised situation specific theory of HF self-care, so we updated the instrument measuring self-care to match the updated theory. The aim of this study was to test the psychometric properties of the revised 29-item Self-Care of Heart Failure Index (SCHFI). METHODS: A cross-sectional design was used in the primary psychometric analysis using data collected at 5 sites in the United States. A longitudinal design was used at the site collecting test-retest data. We tested SCHFI validity with confirmatory factor analysis and predictive validity in relation to health-related quality of life. We tested SCHFI reliability with Cronbach α, global reliability index, and test-retest reliability. RESULTS: Participants included 631 adults with HF (mean age, 65 ± 14.3 years; 63% male). A series of confirmatory factor analyses supported the factorial structure of the SCHFI with 3 scales: Self-Care Maintenance (with consulting behavior and dietary behavior dimensions), Symptom Perception (with monitoring behavior and symptom recognition dimensions), and Self-Care Management (with recommended behavior and problem-solving behavior dimensions). Reliability estimates were 0.70 or greater for all scales. Predictive validity was supportive with significant correlations between SCHFI scores and health-related quality-of-life scores. CONCLUSIONS: Our analysis supports validity and reliability of the SCHFI v7.2. It is freely available to users on the website: www.self-care-measures.com.

Development and initial testing of the self-care of chronic illness inventory.

AIM: The aim was to develop and psychometrically test the self-care of chronic illness Inventory, a generic measure of self-care. BACKGROUND: Existing measures of self-care are disease-specific or behaviour-specific; no generic measure of self-care exists. DESIGN: Cross-sectional survey. METHODS: We developed a 20-item self-report instrument based on the Middle Range Theory of Self-Care of Chronic Illness, with three separate scales measuring Self-Care Maintenance, Self-Care Monitoring, and Self-Care Management. Each of the three scales is scored separately and standardized 0-100 with higher scores indicating better self-care. After demonstrating content validity, psychometric testing was conducted in a convenience sample of 407 adults (enrolled from inpatient and outpatient settings at five sites in the United States and ResearchMatch.org). Dimensionality testing with confirmatory factor analysis preceded reliability testing. RESULTS: The Self-Care Maintenance scale (eight items, two dimensions: illness-related and health-promoting behaviour) fit well when tested with a two-factor confirmatory model. The Self-Care Monitoring scale (five items, single factor) fitted well. The Self-Care Management scale (seven items, two factors: autonomous and consulting behaviour), when tested with a two-factor confirmatory model, fitted adequately. A simultaneous confirmatory factor analysis on the combined set of items supported the more general model. CONCLUSION: The self-care of chronic illness inventory is adequate in reliability and validity. We suggest further testing in diverse populations of patients with chronic illnesses.

Development and psychometric testing of a theory-based tool to measure self-care in diabetes patients: the Self-Care of Diabetes Inventory.

BACKGROUND: Self-care is essential for patients with diabetes mellitus. Both clinicians and researchers must be able to assess the quality of that self-care. Available tools have various limitations and none are theoretically based. The aims of this study were to develop and to test the psychometric properties of a new instrument based on the middle range-theory of self-care of chronic illness: the Self-Care of Diabetes Inventory (SCODI). METHODS: Forty SCODI items (5 point Likert type scale) were developed based on clinical recommendations and grouped into 4 dimensions: self-care maintenance, self-care monitoring, self-care management and self-care confidence based on the theory. Content validity was assessed by a multidisciplinary panel of experts. A multi-centre cross-sectional study was conducted in a consecutive sample of 200 type 1 and type 2 diabetes patients. Dimensionality was evaluated by exploratory factor analyses. Multidimensional model based reliability was estimated for each scale. Multiple regression models estimating associations between SCODI scores and glycated haemoglobin (HbA1c), body mass index, and diabetes complications, were used for construct validity. RESULTS: Content validity ratio was 100%. A multidimensional structure emerged for the 4 scales. Multidimensional model-based reliabilities were between 0.81 (maintenance) and 0.89 (confidence). Significant associations were found between self-care maintenance and HbA1c (p = 0.02) and between self-care monitoring and diabetes complications (p = 0.04). Self-care management was associated with BMI (p = 0.004) and diabetes complications (p = 0.03). Self-care confidence was a significant predictor of self-care maintenance, monitoring and management (all p < 0.0001). CONCLUSION: The SCODI is a valid and reliable theoretically-grounded tool to measure self-care in type 1 and type 2 DM patients.

Psychometric evaluation of the Caregiver Preparedness Scale in caregivers of adults with heart failure.

Well-prepared informal caregivers play an important role in heart failure (HF) care, so an instrument to evaluate their preparedness to care is important. To date, HF caregiver preparedness has been rarely investigated quantitatively. The Caregiver Preparedness Scale (CPS) has been used in other chronic condition populations, but its psychometric characteristics have never been tested in HF caregivers. The purpose of this study was to test the validity and reliability of the 8-item CPS in HF caregivers. In a convenience sample of 317 HF caregivers (72.4% female, mean age 54), we tested the CPS' factorial structure with confirmatory factor analysis (CFA) and its concurrent validity with the Caregiver Contribution to Self-Care of HF Index (CC-SCHFI), and the Hospital Anxiety and Depression Scale (HADS). We also tested CPS' reliability with composite reliability indicators, Cronbach's alpha, factor score determinacy coefficient, and intraclass correlation coefficient (ICC). The CFA for a one-factor model resulted in supportive fit indices (e.g., comparative fit index .97). Significant correlations (p < .05) of the CPS with both the CC-SCHFI and the HADS supported concurrent validity. The composite reliability index, Cronbach's alpha, factor score determinacy coefficient, and ICC were .89, .91, .96, .91, respectively, supporting reliability. Our study provides evidence that the CPS is a valid and reliable instrument to measure HF caregiver preparedness, enabling clinicians, and researchers to target specific interventions to HF caregivers.

Moral Disengagement Strategies in Sex Offenders.

Sexual abuse is a heterogeneous phenomenon. The literature on sexual offenders considers risk factors in the individual and familial history as well as precursors such as cognitive distortions, defence mechanisms and moral disengagement (MD) mechanisms. This study investigates the MD in sex offenders and non-sex offenders in a sample of 362 males comprising a control group of 268 non-offenders, a group of 42 detained sex offenders and a group of 52 detained non-sex offenders. Participants were administered a semi-structured interview and the Moral Disengagement Scale (MDS). The results show a significant difference between the jailed participants (non-sex offenders and sex offenders) and controls; offenders were found to generally display overall higher levels of MD. Among the jailed participants, sex offenders seem to make more use of MD mechanisms than non-sex offenders.

Nurse moral disengagement.

BACKGROUND: Ethics is a founding component of the nursing profession; however, nurses sometimes find it difficult to constantly adhere to the required ethical standards. There is limited knowledge about the factors that cause a committed nurse to violate standards; moral disengagement, originally developed by Bandura, is an essential variable to consider. RESEARCH OBJECTIVES: This study aimed at developing and validating a nursing moral disengagement scale and investigated how moral disengagement is associated with counterproductive and citizenship behaviour at work. RESEARCH DESIGN: The research comprised a qualitative study and a quantitative study, combining a cross-validation approach and a structural equation model. PARTICIPANTS AND RESEARCH CONTEXT: A total of 60 Italian nurses (63% female) involved in clinical work and enrolled as students in a postgraduate master's programme took part in the qualitative study. In 2012, the researchers recruited 434 nurses (76% female) from different Italian hospitals using a convenience sampling method to take part in the quantitative study. ETHICAL CONSIDERATIONS: All the organisations involved and the university gave ethical approval; all respondents participated on a voluntary basis and did not receive any form of compensation. FINDINGS: The nursing moral disengagement scale comprised a total of 22 items. Results attested the mono-dimensionality of the scale and its good psychometric properties. In addition, results highlighted a significant association between moral disengagement and both counterproductive and citizenship behaviours. DISCUSSION: Results showed that nurses sometimes resort to moral disengagement in their daily practice, bypassing moral and ethical codes that would normally prevent them from enacting behaviours that violate their norms and protocols. CONCLUSION: The nursing moral disengagement scale can complement personnel monitoring and assessment procedures already in place and provide additional information to nursing management for designing interventions aimed at increasing compliance with ethical codes by improving the quality of the nurses' work environment.

The problem with Cronbach's Alpha: comment on Sijtsma and van der Ark (2015).

Knowledge of a scale's dimensionality is an essential preliminary step to the application of any measure of reliability derived from classical test theory--an approach commonly used is nursing research. The focus of this article is on the applied aspects of reliability and dimensionality testing. Throughout the article, the Self-Care of Heart Failure Index is used to exemplify real-world data challenges of quantifying reliability and to provide insight into how to overcome such challenges.

Dimensionality and reliability of the self-care of heart failure index scales: further evidence from confirmatory factor analysis.

The Self-Care of Heart Failure Index (SCHFI) is used widely, but issues with reliability have been evident. Cronbach alpha coefficient is usually used to assess reliability, but this approach assumes a unidimensional scale. The purpose of this article is to address the dimensionality and internal consistency reliability of the SCHFI. This was a secondary analysis of data from 629 adults with heart failure enrolled in three separate studies conducted in the northeastern and northwestern United States. Following testing for scale dimensionality using confirmatory factor analysis, reliability was tested using coefficient alpha and alternative options. Confirmatory factor analysis demonstrated that: (a) the Self-Care Maintenance Scale has a multidimensional four-factor structure; (b) the Self-Care Management Scale has a two-factor structure, but the primary factors loaded on a common higher-order factor; and (c) the Self-Care Confidence Scale is unidimensional. Reliability estimates for the three scales, obtained with methods compatible with each scale's dimensionality, were adequate or high. The results of the analysis demonstrate that issues of dimensionality and reliability cannot be separated. Appropriate estimates of reliability that are consistent with the dimensionality of the scale must be used. In the case of the SCHFI, coefficient alpha should not be used to assess reliability of the self-care maintenance and the self-care management scales, due to their multidimensionality. When performing psychometric evaluations, we recommend testing dimensionality before assessing reliability, as well using multiple indices of reliability, such as model-based internal consistency, composite reliability, and omega and maximal reliability coefficients.

Validity and reliability of the caregiver contribution to self-care of heart failure index.

BACKGROUND: Caregivers make an important contribution to the self-care of patients with heart failure (HF), but few instruments are available to measure this contribution. OBJECTIVE: The objective of this study was to test the psychometric properties of the Caregiver Contribution to Self-care of Heart Failure Index (CC-SCHFI), an instrument derived from the Self-care of Heart Failure Index version 6.2. The CC-SCHFI measures the contribution of caregivers to the self-care maintenance and self-care management of HF patients, as well as their confidence in their ability to contribute to the patients' HF self-care. METHODS: A cross-sectional design was used to study 291 Italian caregivers whose HF patients were cared for in 17 cardiovascular centers across Italy. Caregivers completed the CC-SCHFI and a sociodemographic questionnaire. Caregivers were retested on the CC-SCHFI 2 weeks later to assess test-retest reliability. RESULTS: Most caregivers were women (66%) with a mean age of 59 years. First- and second-order confirmatory factor analysis (CFA) for each CC-SCHFI scale showed good model fit: χ2 = 37.22, P = .08, Comparative Fit Index (CFI) = 0.97, Non-Normed Fit Index (NNFI) = 0.96 for caregiver contribution to self-care maintenance (second-order CFA); χ2 = 14.05, P = .12, CFI = 0.96, NNFI = 0.93 for caregiver contribution to self-care management (first-order CFA); and χ2 = 10.63, P = .15, CFI = 0.99, NNFI = 0.98 for caregiver confidence in contributing to self-care (second-order CFA). The CC-SCHFI was able to discriminate statistical and clinical differences between 2 groups of caregivers who had received or not received HF self-care education. Internal consistency reliability measured by factor score determinacy was more than .80 for all factors and scales except for 1 factor in the caregiver contribution to self-care management scale (.65). Test-retest reliability computed by intraclass correlation coefficient was high (>0.90) for most factors and scales. CONCLUSION: The CC-SCHFI showed good psychometric properties of validity and reliability and can be used to measure the contribution of caregiver to HF patient self-care.

Psychometric testing of the Self-Care of Heart Failure Index Version 6.2.

The Self-Care of Heart Failure Index Version 6.2 (SCHFI v.6.2) is widely used, but its psychometric profile is still questioned. In a sample of 659 heart failure patients from Italy, we performed confirmatory factor analysis (CFA) to test the original construct of the SCHFI v.6.2 scales (Self-Care Maintenance, Self-Care Management, and Self-Care Confidence), with limited success. We then used exploratory factor analysis to determine the presence of separate scale dimensions, followed by CFA in a separate sub-sample. Construct validity of individual scales showed excellent fit indices: CFI = .92, RMSEA = .05 for the Self-Care Maintenance Scale; CFI = .95, RMSEA = .07 for the Self-Care Management Scale; CFI = .99, RMSEA = .02 for the Self-Care Confidence scale. Contrasting groups validity, internal consistency, and test-retest reliability were supported as well. This evidence provides a new understanding of the structure of the SCHFI v.6.2 and supports its use in clinical practice and research.