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Results for “Structural equation modeling”

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PubMed2006

Structural validity and temporal stability of the 13-item sense of coherence scale: prospective evidence from the population-based HeSSup study.

STUDY OBJECTIVE: To investigate whether the structure of Antonovsky's [Unraveling the Mystery of Health. How People Manage Stress and Stay Well. San Francisco: Jossey-Bass, 1987] 13-item Sense of Coherence (SOC) scale remains invariant across time and across age groups and whether any differences in stability of and mean changes in SOC can be seen between young people and individuals aged 30 or above. DESIGN: Prospective study with a population-based sample of 18,525 Finns of whom 4,682 were under age 30 and 13,843 over age 30 at both the baseline and 5-year follow-up surveys (the HeSSup study). RESULTS: Confirmatory factor analysis supported the correlated 3-factor solution for the SOC scale and its equivalent second-order factor structure at both measurement times and in both age groups. According to Structural Equation Modelling (SEM), SOC was more stable among subjects over 30 years (stability coefficient 0.81) than among younger adults (0.70). The mean level of SOC was higher among subjects over age 30 than subjects under age 30 at both times. The level of SOC increased during the follow-up period in both age groups but to a greater extent among the younger than older age group. CONCLUSIONS: These data suggest relatively high structural validity and high stability for the 13-item SOC measure and support the notion that SOC becomes more stable following maturation. The 13-item SOC measure seems to provide a psychometrically sound survey instrument for testing Antonovsky's theory on life orientation and health.

Adaptation, Psychological↗

PubMed1998

A confirmatory factor analysis of posttraumatic stress symptoms.

Investigators have recently identified a two-factor structure underlying posttraumatic stress symptoms through the use of exploratory factor analysis. [Taylor et al. (1988). The structure of posttraumatic stress symptoms. Journal of Abnormal Psychology, 107, 154-160]. These two factors, which were labeled as Intrusion and Avoidance, and Hyperarousal and Numbing, are consistent with current theoretical models of posttraumatic stress disorder--PTSD [e.g. Foa et al. (1992). Uncontrollability and unpredictability in post-traumatic stress disorder: An animal model. Psychological Bulletin, 112, 218-238]. However, the authors of the Taylor et al. study issued caution in interpreting their findings because there has yet to be a systematic replication of their results. This paper presents a confirmatory factor analysis of the two-factor structure of posttraumatic stress symptoms in 217 survivors of serious motor vehicle accidents with varying degrees of PTSD symptoms. A hierarchical, confirmatory-factor analysis conducted with a structural equation modeling statistics package confirmed that the model proposed by Taylor et al. can adequately account for the presentation of PTSD symptoms in this sample of motor vehicle accident survivors. The implications for the assessment and diagnosis of PTSD are discussed.

Accidents, Traffic↗

PubMed2005

Conscience in childhood: old questions, new answers.

Although conscience has been the focus of reflection for centuries, fundamental questions regarding its organization have not been fully answered. To address those questions, the authors applied structural equation modeling techniques to longitudinal data comprising multiple behavioral measures of children's conscience, obtained in parallel fashion at 33 and 45 months. The measures encompassed moral emotion (guilt and empathic distress) and rule-compatible conduct (internalization of maternal prohibitions and requests and of another adult's rules). Confirmatory factor analyses supported a differentiated view of conscience with 2 latent factors at both ages: Moral Emotion and Rule-Compatible Conduct. The structure of conscience was remarkably stable over time. The coherence between Moral Emotion and Rule-Compatible Conduct factors increased as children grew older.

Child↗

PubMedDate not supplied

The impact of a health campaign on health social capital.

Referring to literature in sociology, mass communication, and public health, we conceptualize and operationally define "health social capital" and "individual health social capital" and then posit and test a model for its development in response to a public health media campaign. The campaign evaluated here was designed to stimulate behaviors that would provide a more supportive social environment for children and youth, an environment which we consider to be richer in aggregate health social capital. The association model of advertising was employed to explain the development of individual health social capital measures of awareness, attitude, and behavior. With cross-sectional data (1998, n = 614; 1999, n = 1087; 2000, n = 1388), we examine the results for changes in awareness, attitude, and behavior over time and the significant links between these dependent variables and media campaign exposure. The results show significant increases in awareness and attitude, but not in behavior. Structural equation modeling revealed different patterns of influence for newspaper and TV campaign exposure.

Adolescent↗

PubMed2004

Implicit/explicit motive discrepancies and volitional depletion among managers.

The compensatory model of motivation and volition is based on the assumption that discrepancies between implicit and explicit motives lead to psychological conflict, and that resolution of this conflict requires volitional regulation and consumes volitional strength. This suggests that implicit/explicit motive discrepancies (IED) are responsible for decreases in volitional strength. A longitudinal field study with 82 managers was conducted to test this proposition. Results show that IED longitudinally predicted decreases in volitional strength. Furthermore, structural equation modeling revealed that volitional strength mediated the relation between IED and impaired subjective well-being. The theoretical and practical implications of these results are discussed, particularly with respect to volitional depletion.

Adult↗

PubMed2006

Structure of internalising symptoms in early adulthood.

BACKGROUND: Debate surrounds the underlying structure of internalising disorders including major depression, generalised anxiety disorder, phobias and panic disorders. AIMS: To model the within-time and across-time relationships of internalising symptoms, incorporating effects from generalised internalising and disorder-specific components of continuity. METHOD: Data were gathered from a 25-year longitudinal study of a birth cohort of 953 New Zealand children. Outcome measures included DSM-IV symptom scores for major depression, generalised anxiety disorder, phobia and panic disorder at the ages of 18, 21 and 25 years. RESULTS: Structural equation modelling showed that, within-times, a common underlying measure of generalised internalising explained symptom score comorbidities. Across-time correlation of symptom scores was primarily accounted for by continuity over time in generalised internalising. However, for major depression and phobia there was also evidence of across-time continuity in the disorder-specific components of symptoms. CONCLUSIONS: Internalising symptoms can be partitioned into components reflecting both a generalised tendency to internalising and disorder-specific components.

Adolescent↗

PubMed2003

Testing competing path models linking the biochemical variables in red blood cells from Li+-treated bipolar patients.

OBJECTIVES: Red blood cells (RBCs) from Li+-treated bipolar patients have shown abnormalities in intracellular Li+ concentration ([Li+]i), Na+/Li+ exchange rates, and membrane phospholipid levels. Based on Li+-loaded RBC studies, we hypothesized that Li+-treated bipolar patients also have varied intracellular free Mg2+ concentrations ([Mg2+]f) as compared with normotensive patients. We addressed how these experimentally determined values are intercorrelated. Assuming that Li+ treatment alters these biochemical parameters, we provide hypothetical pathways based upon structural equation modeling statistics. METHODS: In RBCs from 30 Li+-treated bipolar patients, we determined [Li+]i, serum [Li+] ([Li+]e), Na+/Li+ exchange parameters, membrane phospholipid levels, [Mg2+]f, and Li+ membrane binding affinities. Comprehensive statistical analyses assessed correlations among the biochemical data. We used path analysis statistics to propose potential pathways in which the data were correlated. RESULTS: We found significant correlations within the three Na+/Li+ exchange parameters and percentage composition of the membrane phospholipids. Additional correlations existed between [Mg2+]f and Vstd, Km, or phospholipid composition, between [Li+]i and percentage of phosphatidylcholine, and between percentage of phosphatidylserine and Km. Based on these findings, we hypothesized and statistically determined the most probable pathway through which these parameters were intercorrelated. CONCLUSIONS: Significant correlations existed between the biochemical parameters that describe the cell membrane abnormality and the Li+/Mg2+ competition hypotheses. Using path analysis statistics, we identified a biochemical pathway by which Li+ may assert its cellular effects. This study serves as an illustrative example how path analysis is a valuable tool in determining the direction of a certain biochemical pathway.

Adult↗

PubMedDate not supplied

Social support, knowledge, and self-efficacy as correlates of osteoporosis preventive behaviors among preadolescent females.

OBJECTIVE: To develop and test a model based on Bandura's social cognitive theory to predict healthy lifestyle behaviors for the prevention of osteoporosis. METHODS: Participants were 354 girls, ages 8-11 years, recruited from area Girl Scout troops. Baseline data from a randomized trial of behavioral interventions are presented. Measures of social support, knowledge, self-efficacy, dietary calcium intake, and weight-bearing physical activity (WBPA) were obtained via interviews and self-administered questionnaires. RESULTS: A structural equation model was tested and fit the data well. Family social support, perceived self-efficacy for eating a calcium-rich diet, and knowledge of WBPA significantly predicted calcium intake. Friend and family support for exercise predicted WBPA. Self-efficacy partially mediated the relationship between family support and calcium intake, as confirmed by Holmbeck's post-hoc probing strategy (2002). CONCLUSIONS: Suggestions are made for primary prevention interventions such as parent and peer involvement, health education, and problem-solving training.

Child↗

PubMed1999

Resource loss, resource gain, and depressive symptoms: a 10-year model.

This study examined a broadened conceptualization of the stress and coping process that incorporated a more dynamic approach to understanding the role of psychosocial resources in 326 adults studied over a 10-year period. Resource loss across 10 years was significantly associated with an increase in depressive symptoms, whereas resource gain across 10 years was significantly associated with a decrease in depressive symptoms. In addition, change in the preponderance of negative over positive events across 10 years was inversely associated with change in resources during the period. Finally, in an integrative structural equation model, the association between change in life events and depressive symptoms at follow-up was completely mediated through resource change.

Adaptation, Psychological↗

PubMed2001

Understanding adherence to hand hygiene recommendations: the theory of planned behavior.

BACKGROUND: Most health care workers (HCWs) are aware of the rationale for hand hygiene procedures, yet failure to adhere to guidelines is common. Little is known about factors that motivate HCWs to practice hand hygiene. PURPOSE: The purposes of this study were to (1) estimate adherence to hand hygiene recommendations; (2) describe relationships among motivational factors, adherence, and intensity of nursing unit activity; and (3) test an explanatory model for adherence to hand hygiene guidelines based on the theory of planned behavior (TPB). METHOD: A longitudinal, observational design was used to collect data from 120 registered nurses employed in critical care and postcritical care units. Nurses provided information about motivational factors and intentions and a self-report of the proportion of time they followed guidelines. At least 2 weeks later, the nurses' hand hygiene performance was observed while they provided patient care. Structural equation modeling was used to test the TPB-based model. RESULTS: Rate of adherence to recommendations for 1248 hand hygiene indications was 70%. The correlation between self-reported and observed adherence to handwashing recommendations was low (r = 0.21). TPB variables predicted intention to handwash, and intention was related to self-reported hand hygiene. Intensity of activity in the nursing unit, rather than TPB variables, predicted observed adherence to hand hygiene recommendations. CONCLUSIONS: The limited association between self-reported and observed hand hygiene scores remains an enigma to be explained. Actual hand hygiene behavior may be more sensitive to the intensity of work activity in the clinical setting than to internal motivational factors.

Attitude of Health Personnel↗

PubMed2004

Learning and strain among newcomers: a three-wave study on the effects of job demands and job control.

The present 3-wave longitudinal study was an examination of job-related learning and strain as a function of job demand and job control. The participants were 311 newcomers to their jobs. On the basis of R. A. Karasek and T. Theorell's (1990) demand-control model, the authors predicted that high demand and high job control would lead to high levels of learning; low demand and low job control should lead to low levels of learning; high demand and low job control should lead to high levels of strain; and low demand and high job control should lead to low levels of strain. The relation between strain and learning was also examined. The authors tested the hypotheses using ANCOVA and structural equation modeling. The results revealed that high levels of strain have an adverse effect on learning; the reverse effect was not confirmed. It appears that Karasek and Theorell's model is very relevant when examining work socialization processes.

Adult↗

PubMedDate not supplied

Cerebrovascular disease and late-life depression: a latent-variable analysis of depressive symptoms after stroke.

OBJECTIVE: The author used a structural-equation modeling approach to examine depression symptom endorsement between geriatric stroke patients and general-medical geriatric patients. From the literature related to cerebrovascular disease and depression, he predicted that geriatric stroke patients would be more likely to endorse symptoms of withdrawal and affective flattening, and less agitation. METHODS: Data from 576 geriatric rehabilitation patients were utilized (N=176 with stroke). Confirmatory factor analysis of the Geriatric Depression Scale was conducted to determine the optimal factor structure for examining symptom endorsement differences between the two groups. MIMIC (Multiple Indicators, Multiple Causes) model analyses were incorporated to examine group differences in depression severity and symptom-cluster endorsement. RESULTS: Results indicate that stroke patients did not demonstrate greater depression severity. There were no differences in endorsement of depressive mood. However, stroke patients were more likely to endorse social withdrawal and less likely to endorse agitation symptoms. CONCLUSIONS: The current results suggest that geriatric stroke patients were more likely, after controlling for depression severity, to endorse greater social withdrawal and less agitation, but not depressed mood. These findings have implications for the types of symptoms evaluated in the context of geriatric stroke and depression.

Aged↗

PubMed2000

Posttraumatic stress disorder among Croatian veterans: a causal model.

The present study investigates the etiological roles of premilitary risk factors, military entry conditions, war zone experiences, dissociative reactions to war zone experiences and homecoming reception in the development of chronic posttraumatic stress disorder (PTSD) among Croatian veterans. A total of 150 Croatian war veterans with the diagnosis of chronic combat-related PTSD, who sought treatment at Psychiatric Clinic, Osijek, Croatia, in the period 1993-1998, and who provided complete data, were selected as the sample for the present study from the treatment-seeking group of the ex-soldier population. Structural equation modeling is used to develop an etiological model concerning the relationships of premilitary risk factors, military entry conditions, war zone experiences, dissociative reactions, and homecoming reception with current symptoms of PTSD. An etiological model with satisfactory fit and parsimony was developed. In terms of the magnitude of variables' total contributions to the development of PTSD, war zone experiences are the most influential contributor which is followed by dissociative reactions, homecoming reception, military entry conditions and premilitary risk factors. Statistical significant direct effects to the development of PTSD were found for dissociative reactions and low family postwar support. The etiology of combat-related PTSD among Croatian veterans remains largely unexplained. Partial explanations are omission of other etiological factors, retrospective nature of the data and small study sample. The results are the source of questions for further research.

Adult↗

PubMed2006

Predicting and modifying substance use in childhood cancer survivors: application of a conceptual model.

PURPOSE/OBJECTIVES: To identify factors that predict or modify substance use in childhood cancer survivors and to describe how a risk-counseling intervention reduced young survivors' substance use. DESIGN: Secondary analysis of clinical trial data and primary analysis of medical record data. SETTING: Outpatient clinic. SAMPLE: 149 females and 118 males 12-18 years of age whose cancer had been in remission for at least two years were randomly assigned to intervention (n = 132) and standard care (n = 135) groups. METHODS: Self-report questionnaires, abstracted medical record data, confirmatory factor analysis, and structural equation modeling. MAIN RESEARCH VARIABLES: Smoking, alcohol consumption, knowledge, risk perceptions, motivation, and worry about cancer and treatment effects. FINDINGS: Three factors directly predicted substance use at baseline: being in a higher grade in school (independent of age), feelings of being more susceptible to late effects of cancer therapy, and worrying more about cancer and its treatment. At follow-up a year later, grade in school and worry predicted increased substance use. In addition, a desire to change health behavior, influenced by the intervention and gender, predicted decreased substance use. The mechanism of influence of the intervention was evident: The intervention led to a need to change, which precipitated a desire to change and ultimately resulted in decreased substance use. CONCLUSIONS: Young survivors' worries and concerns about their cancer and treatment-related late effects are a new intervention target. Motivation is sensitive to behavioral change interventions and positively affects risk reduction. IMPLICATIONS FOR NURSING: Two new intervention strategies to address the impact of survivors' concerns about their cancer and its treatment are implied: (a) Replace substance use with new coping methods to reduce fear and anxiety, and (b) tailor motivation-based interventions to age and gender to communicate graphically and realistically to survivors the personal importance of behavioral change in modifying the risks of late effects.

Adolescent↗

PubMedDate not supplied

A structural model of the relationships among self-efficacy, psychological adjustment, and physical condition in Japanese advanced cancer patients.

We made detailed research for relationships among physical condition, self-efficacy and psychological adjustment of patients with advanced cancer in Japan. The sample consisted of 85 (42 males and 43 females) advanced cancer patients. Interviews were conducted with some measurement scales including the Self-efficacy scale for Advanced Cancer (SEAC), and the Hospital Anxiety and Depression Scale (HADS). Karnofsky Performance Status (KPS) and medication status were also recorded from the evaluation by physicians. We used structural equation modeling (SEM) for statistical analysis. The analysis revealed that the model, including three self-efficacy subscales, depression, anxiety, KPS, meal-, liquid-intake, prognosis and three latent variables: 'Self-efficacy', 'Emotional Distress', and 'Physical Condition,' fit the data (chi-square(24)=28.67, p=0.23; GFI=0.93; CFI=0.98; RMSEA=0.05). In this model, self-efficacy accounted for 71% of the variance in emotional distress and physical condition accounted for 8% of the variance in self-efficacy. Overall, our findings suggest clearly that close relationships existed among physical condition, self-efficacy and emotional distress. That is, patients in good physical condition had a high self-efficacy, and patients with high self-efficacy were less emotionally distressed. These results imply that psychological intervention which emphasizes self-efficacy would be effective for advanced cancer patients.

Adaptation, Psychological↗

PubMed2006

Best friends and alcohol consumption in adolescence: a within-family analysis.

Although friends and siblings are considered to be important role models in adolescents' peer contexts, these peer influences on adolescent alcohol consumption over time are seldom examined simultaneously in a within-family design. The present study examined the relative impact of alcohol use of the best friend, adolescent sibling and sibling's best friend on the development of alcohol consumption during adolescence. Data reported in this study are part of an ongoing longitudinal questionnaire study among families with two adolescent siblings (N=416). Results from structural equation modeling showed a strong similarity in drinking between best friends and adolescents cross-sectionally. Over time, however, only marginal effects of friends alcohol use on drinking of the youngest sibling, and no effects for the oldest sibling were found. Robust evidence was found for peer-selection processes. In addition, we found a moderate to high relative similarity in drinking within sibling pairs, but no longitudinal effect of sibling's drinking. We also found no support for a possible additional influence of sibling's best friend's drinking on adolescent drinking. Therefore, we tested several potential moderating variables on peer influences, but found no effects of a set of relationship characteristics or individual characteristics on the links between peer and adolescent drinking over time.

Adolescent↗

PubMedDate not supplied

Motivational antecedents to contraceptive method change following a pregnancy scare: a couple analysis.

In this study we develop and then test a couple model of contraceptive method choice decision-making following a pregnancy scare. The central constructs in our model are satisfaction with one's current method and confidence in the use of it. Downstream in the decision sequence, satisfaction and confidence predict desires and intentions to change methods. Upstream they are predicted by childbearing motivations, contraceptive attitudes, and the residual effects of the couples' previous method decisions. We collected data from 175 mostly unmarried and racially/ethnically diverse couples who were seeking pregnancy tests. We used LISREL and its latent variable capacity to estimate a structural equation model of the couple decision-making sequence leading to a change (or not) in contraceptive method. Results confirm most elements in our model and demonstrate a number of important cross-partner effects. Almost one-half of the sample had positive pregnancy tests and the base model fitted to this subsample indicates less accuracy in partner perception and greater influence of the female partner on method change decision-making. The introduction of some hypothesis-generating exogenous variables to our base couple model, together with some unexpected findings for the contraceptive attitude variables, suggest interesting questions that require further exploration.

Adult↗

PubMed2006

Applying a health behavior theory to explore the influence of information and experience on arsenic risk representations, policy beliefs, and protective behavior.

The common sense model (CSM) shows how people process information to construct representations, or mental models, that guide responses to health threats. We applied the CSM to understand how people responded to information about arsenic-contaminated well water. Constructs included external information (arsenic level and information use), experience (perceived water quality and arsenic-related health effects), representations, safety judgments, opinions about policies to mitigate environmental arsenic, and protective behavior. Of 649 surveys mailed to private well users with arsenic levels exceeding the maximum contaminant level, 545 (84%) were analyzed. Structural equation modeling quantified CSM relationships. Both external information and experience had substantial effects on behavior. Participants who identified a water problem were more likely to reduce exposure to arsenic. However, about 60% perceived good water quality and 60% safe water. Participants with higher arsenic levels selected higher personal safety thresholds and 20% reported a lower arsenic level than indicated by their well test. These beliefs would support judgments of safe water. A variety of psychological and contextual factors may explain judgments of safe water when information suggested otherwise. Information use had an indirect effect on policy beliefs through understanding environmental causes of arsenic. People need concrete information about environmental risk at both personal and environmental-systems levels to promote a comprehensive understanding and response. The CSM explained responses to arsenic information and may have application to other environmental risks.

Arsenic↗