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Results for “Structural equation modeling”

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PubMed2005

The mediating role of health beliefs in the relationship between depressive symptoms and medication adherence in persons with diabetes.

BACKGROUND: Although bivariate relationships between depressive symptoms, health beliefs, and medication adherence have been identified, the complex relationship among these 3 constructs has not been explicated. OBJECTIVE: This study examines the mediating role of patients' beliefs about diabetes and diabetes medications in relation to depressive symptoms and diabetes medication adherence. METHODS: A survey was sent to 1700 persons with type 2 diabetes who were enrolled in a managed care organization in the United States. The bivariate relationships between depressive symptoms, diabetes-related health beliefs, and diabetes medication adherence were assessed. A structural equation model was developed to determine if health beliefs mediated the relationship between depressive symptoms and medication adherence. RESULTS: Usable responses were received from 445 subjects. Greater depressive symptoms were associated with lower adherence to diabetes medications. The structural equation model indicated that the effect of depressive symptoms on medication adherence was mediated through perceived side effect barriers, perceived general barriers, and self-efficacy. Patients with severe depressive symptoms perceived more barriers to treatment adherence and were less confident in their ability to adhere to medication. In turn, reduced self-efficacy and heightened perceived barriers had a negative association with patients' adherence to diabetes medication regimens. CONCLUSIONS: Decreased adherence to diabetes medications in patients with both diabetes and depressive symptoms may be partly explained by the association of depression with patients' beliefs about diabetes medications and their self-efficacy for medication use.

Depression↗

PubMed2001

Age differences in stress, social resources, and well-being in middle and older age.

The present study examines the interrelationships among the constructs of social resources, stress, and well-being in middle-aged and older adults. Two samples of 489 middle-aged adults (41-43 years) and 449 older adults (61-63 years) from the Interdisciplinary Longitudinal Study of Adult Development were compared with respect to the availability of social resources, levels of stress, and well-being. The data were used to construct separate structural equation models explaining the influence of stress and social resources on well-being in the two groups. The results indicate higher levels of health-related stress and similar levels of social resources in the older group. Structural equation models and examination of total and indirect effects confirmed that a stress-suppression model has the best fit in explaining the interrelationships between stress, social resources, and well-being. There was a strong effect of stress on well-being, no direct effect of social resources on well-being, and a mediating effect of stress on well-being. The relative contributions of stress and resources to well-being were comparable between age groups.

Adult↗

PubMed2001

The relationship of work avoidance and learning goals to perceived competence, externality and meaning.

BACKGROUND: Motivational researchers have suggested that work avoidance may be an academic goal in which students seek to minimise the amount of work they do in school. Additionally, research has also suggested that emotions may be catalysts for goals. AIM: This study examined the relationship between emotions and learning or work avoidance goals. Do emotions explain goals? SAMPLE: The participants were 512 senior high school students in Eastern Canada. METHOD: Students completed a survey assessing motivation related constructs. A structural equation model was postulated in which students' affect predicted learning goals and work avoidant goals. A cluster analysis of affect scores was performed followed by between-group and within-group contrasts of goal scores. RESULTS: The structural equation model suggested that a sense of competence and control were predictive of a learning goal while lack of meaning was related to work avoidance. The cluster analysis showed that confidence and control were associated with a learning goal but that a sense of inadequacy, lack of control or lack of meaning could give rise to work avoidance. CONCLUSIONS: Emotions seem to be directly linked to goals. Teachers who foster feelings of self-assuredness will be helping students develop learning goals. Students who feel less competent, bored or have little control will adopt work avoidant goals.

Adolescent↗

PubMedDate not supplied

Associations of biomarkers, cognition and self-reports of sensory function with self-reported driving behaviour and confidence.

BACKGROUND: Older adults report self-regulating their driving habits but little is known about factors associated with driving habits and driving confidence. OBJECTIVE: We aimed to evaluate cognitive performance, biomarkers and self-reported sensory function as correlates of self-reported driving behaviour and confidence. METHODS: A volunteer sample of 153 drivers aged between 60 and 90 were assessed on biomarkers (vision, hearing, vibration sense, grip strength and FEV(1)), and cognitive performance. A subsample of 121 also completed a questionnaire on driving behaviour, driving confidence and self-reported sensory function. Structural equation modelling techniques were used to evaluate the relative importance of subjective and performance-based variables. RESULTS: Driving behaviour and confidence were associated with cognitive performance, biomarkers, chronological age and one question on self-rated hearing difficulty. Structural equation modelling showed that biomarkers were most important in predicting self- reported driving behaviour. CONCLUSION: These results suggest that individuals self-monitor according to their physiological well-being and report their driving behaviour accordingly.

Aged↗

PubMed2005

Validity and utility of the Craig Hospital Inventory of Environmental Factors for Korean community-dwelling elderly with or without stroke.

The social environmental barriers are considered to be important because the "social participation" of people with impairments would be facilitated by the prevention and reduction of environmental barriers. The Craig Hospital Inventory of Environmental Factors (CHIEF) is one of the few scales to assess the environmental barriers. In this study, we developed the Korean version of CHIEF and evaluated its construct validity and utility in a sample of Korean community-dwelling elderly with or without stroke. We evaluated the construct validity of the CHIEF by testing the original five-factor structure using a confirmatory factor analysis in 400 elderly in Seoul, Korea. The utility of the CHIEF was then assessed by examining the relationships between individual characteristics, Barthel Index and perceived environmental barriers, measured by the CHIEF, using a structural equation modeling approach. The confirmatory factor analysis result demonstrated the validity of a second-order factor model of the CHIEF comprising the five factors as first-order factors. The perceived environmental barrier was a second-order factor when provided acceptable fit indices after two modifications. The structural equation modeling indicates that perceived environmental barriers are significantly related to activities of daily life but not age, gender, and the episode of stroke. The CHIEF is useful in measuring environmental factors for Korean older adults with or without stroke.

Aged↗

PubMedDate not supplied

Pain perception and assessment.

Our inability to measure pain effectively is a major barrier to progress in pain research and advancement in clinical interventions for pain. Historically, the mind-body dichotomy has constrained our thinking about pain and its quantification. One line of work has pursued pain as the sensory end product of nociception: pain is the realization of signals of tissue injury arriving at the cortex. At the other extreme, some clinicians contend that pain is ''what the patient says it is''. In other words, it is a purely mental and entirely subjective phenomenon. Research on functional brain imaging, psychophysiological research and recent neurophysiological research on animal models provide confluent evidence that both of these positions are misleading oversimplifications. Pain is the emergent product of massive, parallel, distributed processing in the brain that engages structures involved in emotion and cognition as well as in sensation. To advance pain measurement, our research team has examined Sokolov's defense response in human subjects experiencing repeated, brief painful electrical shocks delivered to a fingertip through a tiny electrode. Sokolov proposed that threatening events elicit a hypothalamically-orchestrated pattern of arousal that prepares the organism to cope with threat. Measures of sympathetic nervous system arousal and brain evoked potentials in our subjects reveal a stable pattern of this sort when we subject the data to structural equation modeling. When subjects undergo equally intense shocks delivered through a large electrode, they experience a strong vibration-like, unpleasant sensation that causes discomfort but not nociception. The non-painful shock elicits broad levels of arousal equal to those obtained with painful shocks in subjects, but structural equation modeling demonstrates that such arousal does not conform to the defense response pattern. Moreover, multivariate measures of sympathetic arousal and evoked potentials can discriminate painful from non-painful stimuli more accurately than can subjective pain reports. These observations suggest that pain may have a unique psychophysiological signature. More importantly, perhaps, this approach suggests that the combination of psychophysiological research and multivariate statistics provides an avenue for advancing pain research outside of the mind-body dichotomy.

Animals↗

PubMedDate not supplied

Personality and social predictors of atherosclerotic progression: Edinburgh Artery Study.

OBJECTIVE: The aim of this study was to determine whether personality traits and social factors predict the progression of peripheral atherosclerosis. Progression was assessed using the objective, noninvasive ankle brachial pressure index (ABPI). METHODS: In the Edinburgh Artery Study, 1592 men and women were randomly sampled from the general population, and their ABPI was measured at baseline and at the end of a 5-year follow-up period. A low ABPI suggests the presence of peripheral arterial disease. The revised Bedford-Foulds Personality Deviance Scale was administered at baseline to assess submissiveness and hostility. Data on other baseline risk factors, including physiological and social factors, were also collected. RESULTS: Change in ABPI over 5 years was negatively correlated with age in both men and women (men, r = -0.10; women, r = -0.25). In multiple linear regression models, smoking, alcohol consumption, and submissiveness together accounted for 2% of the variance in ABPI change in men; in women, only age was related to change, accounting for 6% of the variance. Well-fitting structural equation models in both sexes showed that age influenced baseline ABPI and change in ABPI; that smoking and social deprivation directly affected baseline ABPI; and that the effect of hostility, and some of the effect of social deprivation, was mediated by smoking. CONCLUSIONS: Social and personality factors were associated directly with baseline ABPI levels and indirectly with progression of atherosclerosis. Structural equation models revealed that associations among personality, social factors, and atherosclerotic progression were complex, involving mediation through other variables.

Aged↗

PubMed1998

Social competence, social support, and attachment: demarcation of construct domains, measurement, and paths of influence for preschool children attending Head Start.

Two studies designed to (1) explore measurement issues for the construct domains of social competence and social support and (2) test a model relating social competence to social support and to child-parent attachment for low-income (primarily African American) preschool children attending Head Start are reported. In Study 1, the definition, measurement, and structure of the social competence construct are evaluated in 2 samples of children. For Study 1A, 167 4-year-old children were assessed with a battery of observation, interview, and Q-sort measures. Relations among the measures suggested a hierarchical structure that was tested using a structural equation model. Results from the analysis supported the conjecture that social competence should be viewed as a hierarchically organized construct. In Study 1B, the model was tested again for a group of 3- and 4-year-old children (n = 265), using a modified set of measures. The general structure of the model from Study 1A was reproduced in this independent sample, although paths from the second-order factor to lower-order factors were not perfectly coordinated across samples. In Study 2, data for a subset of the children in Study 1B (n = 182), gathered with respect to features of their social networks, were examined to assess the structure of their social support networks. Descriptive and structural equation analyses are reported. Sixty-nine of these children were observed at home with their mothers and described using the Waters Attachment Q-sort. A structural equation model testing relations consistent with causal pathways from attachment security to both social support networks and to social competence and from the social support network variable to social competence with peers fit these data with a high degree of confidence. Subsequent analyses locating social competence as antecedent to attachment security were not significant. We conclude that the construct domains of social competence and social support networks can be meaningfully measured for preschool children and that individual differences with respect to these construct domains are related to child-parent relationship qualities.

Child Development↗

PubMed2004

Anxiety sensitivity, fear, and avoidance behavior in headache pain.

Recent research has implicated anxiety sensitivity (AS), the fear of anxiety-related sensations, as a mitigating factor involved in fear and avoidance in patients with chronic back pain [Understanding and treating fear of pain (2004) 3]. Given reported similarities between individuals experiencing chronic pain and those experiencing recurrent headaches, it is theoretically plausible that AS plays a role in influencing fear of pain and avoidance behavior in people with recurrent headache. This has not been studied to date. In the current study we used structural equation modeling to examine the role of AS in fear and avoidance behavior of patients experiencing recurrent headaches. Treatment seeking patients with recurrent headaches completed measures of AS, headache pain severity, pain-related fear, and pain-related escape and avoidance behavior. Structural equation modeling supported the prediction of a direct significant loading of AS on fear of pain. Headache severity also had a direct loading on fear of pain. Results also revealed that AS and headache severity had indirect relationships to pain-related escape and avoidance via their direct loadings on fear of pain. Headache severity also had a small direct loading on escape and avoidance behavior. These results provide compelling evidence that AS may play an important role in pain-related fear and escape and avoidance behavior in patients with recurrent headaches.

Adolescent↗

PubMed2004

An ecological-transactional model of significant risk factors for child psychopathology in outer mongolia.

The present study examined significant risk factors, including child maltreatment, for child psychopathology in a cross-cultural setting. Ninety-nine Mongolian boys, ages 3-10 years, were assessed. Primary caregivers (PCG) completed structured interviews including the Emory Combined Rating Scale (ECRS) and the Mood and Feelings Questionnaire (MFQ). Structural equation modeling identifies eight risk factors affecting child psychopathology: Three with direct effects (severity of physical punishment, PCG's MFQ score, and PCG's education), three with indirect effects (cultural acceptance of violence as discipline, presence of community violence, and contact with extended family), and two with direct and indirect effects (quality of marriage/presence of spousal abuse, and household size). Results support the ecological-transactional theory of developmental psychopathology in a cross-cultural setting. Structural equation modeling provides a useful technique to isolate specific sites for intervention, while maintaining a comprehensive perspective of risk factor interaction.

Anxiety↗

PubMed2005

Genetic and environmental determination of tracking in static strength during adolescence.

The purpose of this study was to determine whether the observed phenotypic stability in static strength during adolescence, as measured by interage correlations in arm pull, is mainly caused by genetic and/or environmental factors. Subjects were from the Leuven Longitudinal Twin Study (n = 105 pairs, equally divided over 5 zygosity groups). Arm-pull data were aligned on age at peak height velocity to attenuate the temporal fluctuations in interage correlations caused by differences in timing of the adolescent growth spurt. Developmental genetic models were fitted using structural equation modeling. After the data were aligned on age at peak height velocity, the annual interage correlations conformed to a quasi-simplex structure over a 4-yr interval. The best-fitting models included additive genetic and unique environmental sources of variation. Additive genetic factors that already explained a significant amount of variation at previous measurement occasions explained 44.3 and 22.5% of the total variation at the last measurement occasion in boys and girls, respectively. Corresponding values for unique environmental sources of variance are 31.2 and 44.5%, respectively. In conclusion, the observed stability of static strength during adolescence is caused by both stable genetic influences and stable unique environmental influences in boys and girls. Additive genetic factors seem to be the most important source of stability in boys, whereas unique environmental factors appear to be more predominant in girls.

Adolescent↗

PubMed2006

Use of home care services effectively reduces feelings of burden among family caregivers of disabled elderly in Japan: preliminary results.

BACKGROUND: Relatively few observational studies have been conducted on the impact of home care services on burden or other aspects of the caregiver's experience. OBJECTIVES: To examine whether the use of care services reduces the feelings of burden among family caregivers in Japan. Specifically, the study was aimed at testing the following three hypotheses: (1) The severity of impairment and the dementia among the disabled elderly increases the feelings of burden among family caregivers and the support from family members decreases burden: (2) the amount of services used by older people and their caregivers is affected by the severity of dementia and ADL deficiencies among the disabled elderly and the amount of support from family members: and (3) controlling for severity, the use of care services under the LTC insurance program serves to reduce the feelings of burden among family caregivers. METHODS: A structural equation model using the data obtained from 82 pairs of community-dwelling disabled elderly and their principal family caregivers. The model included the following variables: age of the disabled elderly; the severity of ADL deficiency and behavioral disturbances; use of formal (public) care services; support from family members; and feelings of burden among family caregivers. RESULTS: The structural equation model revealed that, after controlling for the effects of severity on service use, home care services effectively reduce feelings of burden among family caregivers. CONCLUSIONS: The findings suggest that care services provided under the LTC insurance have been successfully reducing burden among family caregivers in the study area.

Activities of Daily Living↗

PubMed2004

Modeling with measured genotypes: effects of the vitamin D receptor gene, age, and latent genetic and environmental factors on bone mineral density.

We use empirical data to demonstrate a recently proposed framework for including measured genotypes in structural equation models (Van den Oord and Snieder, 2002). The sample consisted of 227 MZ pairs, 197 DZ pairs, and 41 DZ twins without co-twin. The mean age of the female twins was 57 years. The analysis aimed at studying the effect of the vitamin D receptor (VDR) gene polymorphism (VDRGP) on bone mineral density (BMD). Whereas age affected the BMD measures via independent pathways, the effects of the VDRGP plus latent genetic and environmental factors were consistent with a common pathway model. VDRGP explained 0.3% to 0.5% of the variance. These analyses demonstrated that (i) regardless of how much is known about the gene and its products at a molecular level, meaningful questions can be addressed concerning how genes co-act with other variables at a "higher" phenotypic level; (ii) measured genotypes can be treated like any other variable so that the whole structural equation models framework can in principle directly be applied; and (iii) measured genotypes do not need to have large effects to study mechanisms underlying complex traits, and it may even be argued that particularly genes with small effects are better studied within the context of models with multiple variables.

Age Factors↗

PubMed2003

The relations of effortful control and reactive control to children's externalizing problems: a longitudinal assessment.

In this study, we examined the role of negative emotionality as a moderator of the relations of effortful control and overcontrol (versus undercontrol) with children's externalizing problem behaviors; we also examined the longitudinal relations among these variables. Teachers' and parents' reports of children's negative emotionality, effortful control, overcontrol and externalizing problem behaviors were obtained at T1 (N=199; M age=89.51 months) and again 2 (T2) and 4 years (T3) later. In addition, children's effortful control was assessed with an observed measure of persistence. In a T3 concurrent structural equation model, effortful control, but not overcontrol, was negatively related to children's T3 externalizing problem behaviors. In regression analyses, the negative relation between T3 effortful control and externalizing problem behaviors was strongest at high levels of T3 negative emotionality. In the best-fitting longitudinal structural equation model, both T1 effortful control and T1 overcontrol negatively predicted externalizing problems at T1, whereas T3 effortful control (but not T3 overcontrol) was significantly negatively related to T3 externalizing problem behaviors when controlling for T1 externalizing problem behaviors.

Affect↗

PubMed2001

Subjective health complaints in adolescence. A cross-national comparison of prevalence and dimensionality.

BACKGROUND: The purpose of this work was to study the prevalence and dimensionality of subjective health complaints in a cross-national population of adolescents. METHODS: The analyses were based on data from a WHO cross-national survey, Health Behaviour in School-aged Children (HBSC). The study included a representative sample of 11, 13 and 15-year-old adolescents from Finland, Norway, Poland and Scotland. Data were collected in 1993-1994 and the total sample included 20,324 adolescents. Subjective health complaints were measured by the HBSC Symptom Checklist (HBSC-SCL), including headaches, abdominal pain, backache, feeling low, irritability, nervousness, sleeping difficulties and dizziness. Descriptive analyses, MANOVA and structural equation modelling (EQS) were conducted. RESULTS: Patterns of reporting were consistent for all four countries. A large number of students reported a high level of symptoms. The reporting of most symptoms increased with age. Girls reported significantly more symptoms than boys and the gender differences also increased with age. Structural equation modelling suggests a model of two correlated factors, which can be labelled psychological and somatic. CONCLUSION: The findings of this study indicate that students report a high level of subjective health complaints already at the age of 11 years. The reporting of most symptoms increases with age and more so for girls than for boys. The finding of two dimensions that differ qualitatively, suggests that these dimensions may have different etiologies.

Adolescent↗

PubMedDate not supplied

Social network drinking and adult alcohol involvement: a longitudinal exploration of the direction of influence.

Past research shows consistent associations between individuals' drinking patterns and the drinking patterns of their social network members. This association has usually been attributed to the influence of social networks on individual behavior. Recent studies concerning adolescent drinking behavior suggest that such associations may be due, in part, to selection effects in which individuals form social ties with those who have drinking habits similar to their own. The present study used longitudinal data and structural equation modeling to compare the selection and influence effects among a large representative sample of adults. Results suggested that both selection and influence affect the association between individual and network drinking patterns among adults, but that social selection effects are substantially stronger than social influence effects. A cross-lagged structural equation model with a normed fit index of .975, showed that the path indicating peer influence had a coefficient of .069 (P<.01), whereas the path indicating network selection had a coefficient of .193 (P<.01). Comparisons across age, race, sex, and marital status groups revealed similar results, with stronger selection than influence effects for all groups.

Adolescent↗

PubMed2003

Autistic traits in the general population: a twin study.

BACKGROUND: Recent research has indicated that autism is not a discrete disorder and that family members of autistic probands have an increased likelihood of exhibiting autistic symptoms with a wide range of severity, often below the threshold for a diagnosis of an autism spectrum disorder. OBJECTIVE: To examine the distribution and genetic structure of autistic traits in the general population using a newly established quantitative measure of autistic traits, the Social Responsiveness Scale (formerly known as the Social Reciprocity Scale). METHODS: The sample consisted of 788 pairs of twins aged 7 to 15 years, randomly selected from the pool of participants in a large epidemiologic study (the Missouri Twin Study). One parent of each pair of twins completed the Social Responsiveness Scale on each child. The data were subjected to structural equation modeling. RESULTS: Autistic traits as measured by the Social Responsiveness Scale were continuously distributed and moderately to highly heritable. Levels of severity of autistic traits at or above the previously published mean for patients with pervasive developmental disorder not otherwise specified were found in 1.4% of boys and 0.3% of girls. Structural equation modeling revealed no evidence for the existence of sex-specific genetic influences, and suggested specific mechanisms by which females may be relatively protected from vulnerability to autistic traits. CONCLUSIONS: These data indicate that the social deficits characteristic of autism spectrum disorders are common. Given the continuous distribution of these traits, it may be arbitrary where cutoffs are made between research designations of being "affected" vs "unaffected" with a pervasive developmental disorder. The genes influencing autistic traits appear to be the same for boys and girls. Lower prevalence (and severity) of autistic traits in girls may be the result of increased sensitivity to early environmental influences that operate to promote social competency.

Adolescent↗

PubMed1998

Confirmatory factor analysis of the Task and Ego Orientation in Sport Questionnaire with cross-validation.

Although a number of factor analytic studies have been conducted on the factorial validity of the Task and Ego Orientation in Sport Questionnaire (TEOSQ), the results have been equivocal. To further substantiate its evidence of validity, this study cross-validated the measurement model using a rigorous structural equation modeling (SEM) approach. Data collected from a college student sample were first analyzed on a calibration sample (n = 439). Results confirmed the two-factor orthogonal structure representing the underlying task and ego orientations. The results were cross-validated on a validation sample (n = 439) using various SEM-based cross-validation procedures. Collectively, these findings support the construct validity of the TEOSQ as a measure of achievement goal orientation.

Achievement↗