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PubMedDate not supplied

Predictors of functional ability in geriatric rehabilitation patients.

This study explored the impact that motivation, cognitive status, depression, age, and physical status have on the functional ability of older adults in a rehabilitation program. The study was based on a hypothesized model and was conducted with 200 patients on a geriatric rehabilitation unit. Structural equation modeling was done to test the hypothesized model. The average age of participants was 78 years, and the majority were female, Caucasian, unmarried, and had been admitted for rehabilitation after an orthopedic event. The data fit the hypothesized model; however, only five paths were significant. Mental status was a significant predictor of function on admission and a direct and indirect predictor of function at discharge, and diagnosis and age directly predicted function at discharge.

Activities of Daily Living↗
PubMed2002

Impact of services, met needs, and service empowerment on consumer outcomes.

The current study examined service characteristics, needs, and outcomes of consumers with severe mental disabilities served in a public mental health setting. The study utilized a longitudinal design with three yearly waves of measurement. Data were obtained from consumer interviews and case manager questionnaires. A model specifying relationships between service characteristics, needs, and outcomes was tested using structural equation modeling. This model incorporated service-related variables pertaining to service amounts, service empowerment, and needs in order to gain a better understanding of factors that mediate service effects and account for mental health outcomes. The model focused on consumers' perspectives, in order to highlight the importance of consumers' opinions about their mental health services and needs. The results suggested that consumers' perceptions that their needs are met were related to better symptomatology and quality of life outcomes. In addition, consumers' perceptions that they had some say in service-related decisions had an indirect effect on mental health outcomes by increasing the likelihood that needs were met according to consumers' perspectives. Results were mixed with regard to the effects of these variables on level of functioning outcomes. Service amount was unrelated to mental health outcomes. Furthermore, service amount was unrelated to consumers' perceptions of needs, suggesting that consumers' views regarding met and unmet needs may not be included sufficiently in decision-making surrounding the provision of services.

Adaptation, Psychological↗
PubMed1997

On the factorial and construct validity of the Intrinsic Motivation Inventory: conceptual and operational concerns.

The Intrinsic Motivation Inventory (IMI) has been gaining acceptance in the sport and exercise domain since the publication of research by McAuley, Duncan, and Tammen (1989) and McAuley, Wraith, and Duncan (1991), which reported confirmatory support for the factorial validity of a hierarchical model of intrinsic motivation. Authors of the present study argue that the results of these studies did not conclusively support the hierarchical model and that the model did not accurately reflect the tenets of cognitive evaluation theory (Deci & Ryan, 1985) from which the IMI is drawn. It is also argued that a measure of perceived locus of causality is required to model intrinsic motivation properly. The development of a perceived locus of causality for exercise scale is described, and alternative models, in which perceived competence and perceived locus of causality are held to have causal influences on intrinsic motivation, are compared with an oblique confirmatory factor analytic model in which the constructs are held at the same conceptual level. Structural equation modeling showed support for a causal model in which perceived locus of causality mediates the effects of perceived competence on pressure-tension, interest-enjoyment, and effort-importance. It is argued that conceptual and operational problems with the IMI, as currently used, should be addressed before it becomes established as the instrument of choice for assessing levels of intrinsic motivation.

Adult↗
PubMed2000

A causal model of depression in early adolescents.

The purpose of this study was to test the extent to which a causal model developed from a theoretical formulation of depression was consistent with data obtained from early adolescents, age 12 to 14. In this cross-sectional correlational design, the final sample consisted of 225 adolescents who responded to a demographic data sheet and instruments measuring depression, self-esteem, state anxiety, and perceived stress in classrooms. The causal model was tested via the LISREL 7 program, using a maximum likelihood structural equation model. The results yielded a chi-square (1, N = 225) = .71, p = .401, indicating a good fit of the model to the data. Perceived stress had the strongest direct, indirect, and total effect on depression in early adolescents. Contrary to expectation, self-esteem did not have a direct effect on depression, and girls did not report higher levels of depression than did boys.

Adolescent↗
PubMed1998

Development of a scale to measure adherence to self-monitoring of blood glucose with latent variable measurement.

OBJECTIVE: Adherence to self-monitoring of blood glucose (SMBG) is problematic for many people with diabetes. Self-reports of adherence have been found to be unreliable, and existing paper-and-pencil measures have limitations. This study developed a brief measure of SMBG adherence with good psychometric properties and a useful factor structure that can be used in research and in practice. RESEARCH DESIGN AND METHODS: A total of 216 adults with diabetes responded to 30 items rated on a 9-point Likert scale that asked about blood monitoring habits. In part I of the study, items were evaluated and retained based on their psychometric properties. The sample was divided into exploratory and confirmatory halves. Using the exploratory half, items with acceptable psychometric properties were subjected to a principal components analysis. In part II of the study, structural equation modeling was used to confirm the component solution with the entire sample. Structural modeling was also used to test the relationship between these components. It was hypothesized that the scale would produce four correlated factors. RESULTS: Principal components analysis suggested a two-component solution, and confirmatory factor analysis confirmed this solution. The first factor measures the degree to which patients rely on others to help them test and thus was named "social influence." The second component measures the degree to which patients use physical symptoms of blood glucose levels to help them test and thus was named "physical influence." Results of the structural model show that the components are correlated and make up the higher-order latent variable adherence. CONCLUSIONS: The resulting 15-item scale provides a short, reliable way to assess patient adherence to SMBG. Despite the existence of several aspects of adherence, this study indicates that the construct consists of only two components. This scale is an improvement on previous measures of adherence because of its good psychometric properties, its interpretable factor structure, and its rigorous empirical development.

Adult↗
PubMed1995

Elderly mothers caring at home for offspring with mental retardation: a model of permanency planning.

A theoretical model of permanency planning based on the double ABCX model of family stress and adaptation (McCubbin & Patterson, 1982) was tested using structural equation modeling. We interviewed 235 mothers, ages 58 to 96, who cared for adult offspring with mental retardation at home. Four variables were confirmed to directly influence their stage of planning: use of services for offspring, non-use of avoidance coping, the self-perception of being adversely affected by age-related changes, and help from offspring without mental retardation. Variables found to affect planning indirectly were perceived need for services, mothers' subjective burden, extent of caregiving tasks, offsprings' disability, and mothers' disability.

Adaptation, Psychological↗
PubMed1989

Robustness of a model of exercise.

A recent longitudinal study of exercise behavior was published in this journal. A structural equation model derived from the theory of reasoned action was evaluated and found to fit the data well. This paper presents further analysis of the data to determine the robustness of the results to modifications of the original model.

Computer Simulation↗
PubMed2001

The structure and stability of common mental disorders: the NEMESIS study.

BACKGROUND: We analyzed the underlying latent structure of 12-month DSM-III-R diagnoses of 9 common disorders for the general population in the Netherlands. In addition, we sought to establish (1) the stability of the latent structure underlying mental disorders across a 1-year period (structural stability) and (2) the stability of individual differences in mental disorders at the level of the latent dimensions (differential stability). METHODS: Data were obtained from the first and second measurement of the Netherlands Mental Health Survey and Incidence Study (NEMESIS) (response rate at baseline: 69.7%, n = 7076; 1 year later, 79.4%, n = 5618). Nine common DSM-III-R diagnoses were assessed twice with the Composite International Diagnostic Interview with a time lapse of 1 year. Using structural equation modeling, the number of latent dimensions underlying these diagnoses was determined, and the structural and differential stability were assessed. RESULTS: A 3-dimensional model was established as having the best fit: a first dimension underlying substance use disorders (alcohol dependence, drug dependence); a second dimension for mood disorders (major depression, dysthymia), including generalized anxiety disorder; and a third dimension underlying anxiety disorders (simple phobia, social phobia, agoraphobia, and panic disorder). The structural stability of this model during a 1-year period was substantial, and the differential stability of the 3 latent dimensions was considerable. CONCLUSIONS: Our results confirm the 3-dimensional model for 12-month prevalence of mental disorders. Results underline the argument for focusing on core psychopathological processes rather than on their manifestation as distinguished disorders in future population studies on common mental disorders.

Adult↗
PubMed2000

Likelihood of undergoing genetic testing for cancer risk: a population-based study.

BACKGROUND: Studies on public perceptions of genetic susceptibility testing for cancer risks are few and tend to focus on specific cancer risks of higher-risk populations, ignoring the general population and their perceived risk of getting any cancers. This study develops and tests a psychosocial model of the proximal and distal influences on likelihood of undergoing genetic susceptibility testing for cancer risk among a population-based sample. METHODS: The sample consisted of 622 adults aged 18-75 interviewed by telephone. The survey instrument included measures derived from the Health Belief Model and adaptations of existing measures from the literature. Data were analyzed using structural equation modeling techniques. RESULTS: The model suggested independent main effects for perceived benefits, perceived barriers, perceived susceptibility, and pessimism while simultaneously accounting for the effects of age, socioeconomic status, family history of cancer, and awareness of the existence of genetic susceptibility testing for cancer risk. The model explained 34% of the variance in likelihood. CONCLUSIONS: While perceived benefits, perceived barriers, perceived susceptibility, and pessimism may directly impact likelihood, they may also mediate the effects of age, socioeconomic status, family history of cancer, and awareness of cancer genetic susceptibility testing, on likelihood.

Adolescent↗
PubMed1995

A covariance structure analysis of flicker sensitivity.

We tested whether linear structural models of the mechanisms underlying flicker sensitivity could reproduce the variance-covariance matrix of temporal contrast sensitivity data. Monocular sensitivities to frequencies between 2.5 and 45 Hz were measured for 124 subjects, ages 18-88 yr. Exploratory factor analyses revealed that both a two-mechanism and a three-mechanism model could adequately account for the data. Furthermore, confirmatory factor analyses and full structural equation models, using age as an explanatory variable, supported both models, with the three-factor model giving a somewhat better representation of the data. Parsimony favors the two-mechanism model. But patterns of loss associated with pre-exudative age-related maculopathy are more easily understood in terms of three underlying mechanisms.

Adolescent↗
PubMed1999

Age differences in the effects of network composition on psychological distress.

The main goal of this research is to better understand age differences in the effects of social networks on mental health. Using a social network approach to revise the convoy of social support model (Kahn and Antonucci, 1980), we examine specifically how two aspects of social support networks (kin composition and convoy dimensions) influence psychological distress for older and younger samples (18-59 and 60+). We hypothesize that kin composition will influence distress in general but especially for the younger sample, while two competing hypotheses for the convoy of social support model are tested. Using data from a three-wave panel health study, structural equation models (LISREL 8.20) indicate that a greater proportion of kin in the perceived support network and the presence of family members in the inner circle of the convoy significantly reduce distress, primarily for the younger sample. Implications for the convoy model are discussed.

Adolescent↗
PubMed1993

Does psychomotor sensitivity to alcohol predict subsequent alcohol use?

Data from 42 male and 58 female subjects who participated in the Colorado Alcohol Research on Twins and Adoptees (CARTA) project were subjected to model-fitting analyses. The aim of the present study was to use linear structural equation models to determine whether differences in previously measured psychomotor sensitivity to alcohol predict differences in self-reported alcohol consumption over a 4-year period. LISREL model-fitting results indicate that, for male subjects, only rail walking insensitivity is predictive of alcohol use reported 2 years after their initial CARTA testing. For females, only hand steadiness sensitivity is predictive of alcohol use reported 2 years after their initial CARTA testing. The results for males support a hypothesis that would consider alcohol insensitive individuals at greater risk for alcohol abuse. The female results, however, would argue against such a hypothesis. With only one measure of sensitivity predicting alcohol use at only one out of four time points, in both men and women, the overall results suggest that our three measures of psychomotor sensitivity to alcohol are, in general, poor predictors of alcohol consumption in this sample.

Adult↗
PubMed2000

A structural model for predicting mathematics achievement: its relation with anxiety and self-concept in mathematics.

This study proposed and tested a model of mathematics achievement and its relations to antecedent and subsequent factors using structural equations modeling. A sample of elementary school students in Al-Ain school district (n = 394) completed an Arabic version of the Self-description Questionnaire as well as a questionnaire measuring their perception of the importance of mathematics, anxiety about it, and the amount of effort they exerted in studying. Mathematics grades were obtained from the official school records. Importance and effort were positively related to achievement which in turn had a positive path coefficient to self-concept and a negative path to anxiety. The hypothesized model explained 40%, 64%, and 73% of the variance in achievement, self-concept, and anxiety, respectively. The results can be interpreted as indicating that achievement is an important outcome and antecedent construct within the proposed model.

Achievement↗
PubMed1996

Health downturns and predictors of suicidal ideation: an application of the Baumeister model.

Suicidal thoughts and attempts have been studied from a number of perspectives, but only recently has an attempt been made to incorporate many different psychological perspectives into one framework. Baumeister (1990) has integrated personality and social psychological perspectives into one sequential model, moving from instigating events to a final stage of suicidal thoughts. Employing a sample of older adult subjects undergoing the stresses of a recent health downturn, this study tested a four-stage model of suicidal ideation based on many of the components proposed by Baumeister. Structural equation modeling achieved a good fit to the data. Results are discussed in terms of the importance of including life events, particularly poor health, and cognitive variables such as confusions in thinking, in understanding suicidal ideation.

Aged↗
PubMed1999

A structural modeling analysis of anxiety and depression in patients undergoing coronary artery bypass graft surgery: a model generating approach.

The present study is a longitudinal study designed to explore structural relationships between anxiety, depression, personality, and background factors (e.g., gender, age, and complicated medical characteristics) in patients undergoing coronary artery bypass graft (CABG) surgery. At two timepoints before and two after CABG, 217 patients completed self-report questionnaires. To explore structural relationships, the structural equation modeling (SEM) method was applied. Using the model-generating approach, a model was developed, providing a good fit. The structural relationships revealed, in particular, the key position of neuroticism, which was related to both pre- and postoperative anxiety and depression. Relationships between anxiety and depression over time, both intra- and interrelationships, were relatively weak. Relationships between anxiety and depression at the same points in time were relatively strong, with preoperative depression leading to preoperative anxiety, and postoperative anxiety leading to postoperative depression. To provide a useful framework for development of intervention strategies, further research is needed to evaluate the plausibility of the final structural model.

Adult↗
PubMed1991

Structural modeling of mixed longitudinal and cross-sectional data.

In this paper we describe some mathematical and statistical models for dealing with changes over age. We concentrate specifically on the use of a structural equation modeling (SEM) approach (using computer programs like LISREL) to deal with issues of: (1) group differences in regression parameters, (2) differences in longitudinal and cross-sectional results, (3) differences due to longitudinal attrition, and (4) mixtures of these problems. To illustrate these ideas we use data from a previous study of hypertension and intellectual abilities (from Schultz, Elias, Robbins, Streeten, and Blakeman, 1986).

Adult↗
PubMed2002

Urban waste recycling behavior: antecedents of participation in a selective collection program.

The aim of this study is to analyze the antecedents of urban waste recycling behavior. To achieve this goal, a concrete urban waste management program was chosen. The study focuses on the Selective Collection Program (SCP) in Zaragoza, a medium-sized city in northeastern Spain. The research starts with a conceptual model in which the variables that potentially affect recycling behavior can be classified into two groups: incentives and barriers. Moreover, the sociodemographic characteristics of the individuals are included in our study. Given that the proposed model requires specification of latent variables or constructs, the analysis is based on the Structural Equation Models (SEM) methodology. The results revealed that environmental awareness, knowledge of the environmental impact of urban waste, and the positive perception of management by local government exercise a positive effect on individual recycling behavior, while perceived personal difficulties (space and time availability) and distance to and from the container have a negative effect. As regards sociodemographic variables, this study found that annual family income sustains a negative relationship with recycling behavior, while age maintains a positive one. The results obtained clearly show the important role that the public authorities play, especially municipal governments, in achieving the waste recycling objectives established in accordance with international legislation.

Conservation of Natural Resources↗
PubMed1999

Neural modeling, functional brain imaging, and cognition.

The richness and complexity of data sets acquired from PET or fMRI studies of human cognition have not been exploited until recently by computational neural-modeling methods. In this article, two neural-modeling approaches for use with functional brain imaging data are described. One, which uses structural equation modeling, estimates the functional strengths of the anatomical connections between various brain regions during specific cognitive tasks. The second employs large-scale neural modeling to relate functional neuroimaging signals in multiple, interconnected brain regions to the underlying neurobiological time-varying activities in each region. Delayed match-to-sample (visual working memory for form) tasks are used to illustrate these models.

Journal Article↗