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Structural equation modeling

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https://www.readbyqxmd.com/read/27926742/modeling-deficits-from-early-auditory-information-processing-to-psychosocial-functioning-in-schizophrenia
#1
Michael L Thomas, Michael F Green, Gerhard Hellemann, Catherine A Sugar, Melissa Tarasenko, Monica E Calkins, Tiffany A Greenwood, Raquel E Gur, Ruben C Gur, Laura C Lazzeroni, Keith H Nuechterlein, Allen D Radant, Larry J Seidman, Alexandra L Shiluk, Larry J Siever, Jeremy M Silverman, Joyce Sprock, William S Stone, Neal R Swerdlow, Debby W Tsuang, Ming T Tsuang, Bruce I Turetsky, David L Braff, Gregory A Light
Importance: Neurophysiologic measures of early auditory information processing (EAP) are used as endophenotypes in genomic studies and biomarkers in clinical intervention studies. Research in schizophrenia has established correlations among measures of EAP, cognition, clinical symptoms, and functional outcome. Clarifying these associations by determining the pathways through which deficits in EAP affect functioning would suggest when and where to therapeutically intervene. Objectives: To characterize the pathways from EAP to outcome and to estimate the extent to which enhancement of basic information processing might improve cognition and psychosocial functioning in schizophrenia...
December 7, 2016: JAMA Psychiatry
https://www.readbyqxmd.com/read/27925435/predicting-the-intention-to-use-condoms-and-actual-condom-use-behaviour-a-three-wave-longitudinal-study-in-ghana
#2
Enoch Teye-Kwadjo, Ashraf Kagee, Hermann Swart
BACKGROUND: Growing cross-sectional research shows that the theory of planned behaviour (TPB) is robust in predicting intentions to use condoms and condom use behaviour. Yet, little is known about the TPB's utility in explaining intentions to use condoms and condom use behaviour over time. METHODS: This study used a longitudinal design and latent variable structural equation modelling to test the longitudinal relationships postulated by the TPB. School-going youths in Ghana provided data on attitudes, subjective norms, perceived control, intentions, and behaviour regarding condom use at three time points, spaced approximately three months apart...
December 7, 2016: Applied Psychology. Health and Well-being
https://www.readbyqxmd.com/read/27924915/serum-uric-acid-is-independently-and-linearly-associated-with-risk-of-nonalcoholic-fatty-liver-disease-in-obese-chinese-adults
#3
Chang-Qin Liu, Chun-Mei He, Ning Chen, Dongmei Wang, Xiulin Shi, Yongwen Liu, Xin Zeng, Bing Yan, Suhuan Liu, Shuyu Yang, Xiaoying Li, Xuejun Li, Zhibin Li
The present study aimed to explore the independent association and potential pathways between serum uric acid (SUA) and nonalcoholic fatty liver disease (NAFLD). 1365 community-living obese Chinese adults who received hepatic ultrasonography scanning were included. The prevalence rates of NAFLD were 71.5% for men and 53.8% for women. Compared with controls, NAFLD subjects showed significantly increased SUA levels (333.3 ± 84.9 v.s. 383.4 ± 93.7 μmol/L) and prevalence rate of hyperuricemia (HUA) (25...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924623/does-inflammation-mediate-relationships-between-racial-identity-and-onset-of-menopause-among-us-adults
#4
Alexandra C H Nowakowski, Katelyn Y Graves
We assess how well differences in ethnoracial background may predict timing of menopause among females in the USA and whether or not inflammatory biomarker levels appear to mediate these overall associations. We use data from the National Social Life, Health, and Aging Project (NSHAP) to model apparent net effects from race on menopausal onset, as well as possible mediating influences from the inflammatory biomarker C-reactive protein (CRP). Using continuous time event history analysis, we assess and frame overall relationships between race and menopausal age...
December 6, 2016: Journal of Racial and Ethnic Health Disparities
https://www.readbyqxmd.com/read/27924282/a-computationally-efficient-algorithm-for-fitting-ion-channel-parameters
#5
Zachary R Teed, Jonathan R Silva
Continuous time Markov models have been widely used to describe ion channel kinetics, providing explicit representation of channel states and transitions. Fitting models to experimental data remains a computationally demanding task largely due to the high cost of model evaluation. Here, we propose a method to efficiently optimize model parameters and structure. Voltage clamp channel protocols can be decomposed into a series of fixed steps of constant voltage resulting in a set of linear systems of differential equations...
2016: MethodsX
https://www.readbyqxmd.com/read/27923966/thinking-style-as-a-predictor-of-men-s-participation-in-cancer-screening
#6
Clare E McGuiness, Deborah Turnbull, Carlene Wilson, Amy Duncan, Ingrid H Flight, Ian Zajac
Men's participation in cancer screening may be influenced by their thinking style. Men's need for cognition (NFC) and faith in intuition were measured to explore whether they varied by demographic variables or predicted screening behavior. Australian males (n = 585, aged 50-74 years) completed surveys about past screening and were subsequently offered mailed fecal occult blood tests (FOBTs). Demographic predictors included age, socioeconomic status, educational attainment, and language spoken at home. The screening behaviors were self-reported prostate cancer screening (prostate-specific antigen testing and digital rectal examinations [DREs]), and colorectal cancer screening (self-reported FOBT participation and recorded uptake of the FOBT offer)...
December 5, 2016: American Journal of Men's Health
https://www.readbyqxmd.com/read/27923874/inmate-violence-and-correctional-staff-burnout-the-role-of-sense-of-security-gender-and-job-characteristics
#7
Anna Isenhardt, Ueli Hostettler
Violence in the workplace has serious consequences for employees and organizations. Based on a survey in early 2012 among employees from all work areas of 89 of the total 112 correctional facilities in Switzerland resulting in a sample of 2,045 employees (response rate 48.5%), this study (a) analyzed whether victimization has an impact on correctional staff burnout, (b) tested the hypothetical mediating role of sense of security in the relationship between victimization and burnout, and (c) included gender and job characteristics because work experiences and exposure to violence of staff differ strongly with gender and work tasks...
December 5, 2016: Journal of Interpersonal Violence
https://www.readbyqxmd.com/read/27923327/formation-of-nanofibrous-matrices-3d-scaffolds-and-microspheres-from-theory-to-practice
#8
Chi Ma, Xiaohua Liu
Nanofibrous architecture presents unique biophysical cues to facilitate cellular responses and is considered an indispensable feature of a biomimetic three-dimensional (3D) scaffold and cell carrier. While electrospinning is a widely used method to prepare natural extracellular matrix-like nanofibers, it faces significant challenges to incorporate nanofibrous architecture into well-defined macroporous 3D scaffolds or injectable microspheres. Here we report a non-electrospinning approach that is generally effective at generating nanofibers from a variety of synthetic and natural biodegradable polymers and integrating these nanofibers into (1) 3D scaffolds with constructive geometry and designed internal macropore structures; and (2) injectable microspheres...
December 6, 2016: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/27923064/sparse-regression-based-structure-learning-of-stochastic-reaction-networks-from-single-cell-snapshot-time-series
#9
Anna Klimovskaia, Stefan Ganscha, Manfred Claassen
Stochastic chemical reaction networks constitute a model class to quantitatively describe dynamics and cell-to-cell variability in biological systems. The topology of these networks typically is only partially characterized due to experimental limitations. Current approaches for refining network topology are based on the explicit enumeration of alternative topologies and are therefore restricted to small problem instances with almost complete knowledge. We propose the reactionet lasso, a computational procedure that derives a stepwise sparse regression approach on the basis of the Chemical Master Equation, enabling large-scale structure learning for reaction networks by implicitly accounting for billions of topology variants...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27923013/community-mobilization-for-hiv-testing-uptake-results-from-a-community-randomized-trial-of-a-theory-based-intervention-in-rural-south-africa
#10
Sheri A Lippman, Torsten B Neilands, Catherine MacPhail, Dean Peacock, Suzanne Maman, Dumisani Rebombo, Rhian Twine, Amanda Selin, Hannah H Leslie, Kathleen Kahn, Audrey Pettifor
BACKGROUND: HIV testing uptake in South Africa is below optimal levels. Community mobilization (CM) may increase and sustain demand for HIV testing, however, little rigorous evidence exists regarding the effect of CM interventions on HIV testing and the mechanisms of action. METHODS: We implemented a theory-driven CM intervention in 11 of 22 randomly-selected villages in rural Mpumalanga Province. Cross-sectional surveys including a community mobilization measure were conducted before (n = 1181) and after (n = 1175) a 2-year intervention (2012-2014)...
January 1, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/27921393/the-role-of-the-microvascular-network-structure-on-diffusion-and-consumption-of-anti-cancer-drugs
#11
P Mascheroni, R Penta
We investigate the impact of microvascular geometry on the transport of drugs in solid tumors, focusing on the diffusion and consumption phenomena. We embrace recent advances in the asymptotic homogenization literature starting from a double Darcy, double advection-diffusion-reaction system of partial differential equations that is obtained exploiting the sharp length separation between the intercapillary distance and the average tumor size. The geometric information on the microvascular network is encoded into effective hydraulic conductivities and diffusivities, which are numerically computed by solving periodic cell problems on appropriate microscale representative cells...
December 6, 2016: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/27921001/the-relation-between-marital-adjustment-and-posttraumatic-growth-in-infertile-couples-the-mediatory-role-of-religious-coping-strategies
#12
Seyyedeh Fatemeh Ghafouri, Saeed Ghanbari, Hajar Fallahzadeh, Omid Shokri
BACKGROUND: Infertility as a crisis can both lead to negative reactions and stress in infertile couples and bring about positive reactions and growth, to which henceforth posttraumatic growth is referred. This study was conducted to model the relation between martial adjustment and posttraumatic growth through the mediation of religious coping strategies in infertile couples. METHODS: This correlation-based study was performed on 250 couples at the infertility center of Shariati hospital, Tehran, Iran, selected via convenience sampling...
October 2016: Journal of Reproduction & Infertility
https://www.readbyqxmd.com/read/27920734/role-of-stressful-life-events-avoidant-coping-styles-and-neuroticism-in-online-game-addiction-among-college-students-a-moderated-mediation-model
#13
Huanhuan Li, Yingmin Zou, Jiaqi Wang, Xuelin Yang
Online game addiction (OGA) is becoming a significant problem worldwide. The aim of this study was to explore the incidence of OGA and the roles of stressful life events, avoidant coping styles (ACSs), and neuroticism in OGA. A total of 651 Chinese college students were selected by random cluster sampling. Subjects completed the Chinese version of Young's eight-item Internet Addiction Scale (CIAS), Online Game Cognition Addiction Scale (OGCAS), Revised Eysenck Personality Questionnaire Short Scale in Chinese (EPQ-RSC), Chinese College-student Stress Questionnaire, and Coping Style Questionnaire...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27920505/illness-perceptions-and-stress-mediators-between-disease-severity-and-psychological-well-being-and-quality-of-life-among-patients-with-crohn-s-disease
#14
Maochen Zhang, Liwen Hong, Tianyu Zhang, Yun Lin, Sichang Zheng, Xiaolin Zhou, Rong Fan, Zhengting Wang, Chenli Zhang, Jie Zhong
BACKGROUND: Disease severity, illness perceptions, coping strategies, stress, psychological well-being, and quality of life were reported to have close relationships. According to the Common Sense Model, illness perceptions and coping strategies could mediate the relationship between illness stimuli and illness outcomes such as psychological health and quality of life. Stress was also associated with the individual's disease severity, anxiety, depression, and quality of life. OBJECTIVES: The study aimed to explore the influencing factors of illness outcomes, and to what extent illness perceptions, coping strategies, and stress mediate the relationship between disease severity and anxiety, and depression and quality of life...
2016: Patient Preference and Adherence
https://www.readbyqxmd.com/read/27920366/a-graphical-perspective-of-marginal-structural-models-an-application-for-the-estimation-of-the-effect-of-physical-activity-on-blood-pressure
#15
Denis Talbot, Amanda M Rossi, Simon L Bacon, Juli Atherton, Geneviève Lefebvre
Estimating causal effects requires important prior subject-matter knowledge and, sometimes, sophisticated statistical tools. The latter is especially true when targeting the causal effect of a time-varying exposure in a longitudinal study. Marginal structural models are a relatively new class of causal models that effectively deal with the estimation of the effects of time-varying exposures. Marginal structural models have traditionally been embedded in the counterfactual framework to causal inference. In this paper, we use the causal graph framework to enhance the implementation of marginal structural models...
December 5, 2016: Statistical Methods in Medical Research
https://www.readbyqxmd.com/read/27920351/effects-of-pediatric-anticipatory-guidance-on-mothers-of-young-children
#16
Hui-Chin Hsu, Shih-Yu Lee, Chin-Man Lai, Wan-Ling Tsai, Hsiao-Tung Chiu
Provision of anticipatory guidance to parents during well-child visits is a defining component of pediatric primary care. Using nationally representative data from the 2000 U.S. National Survey of Early Childhood Health, this study addressed the questions of whether, how, and what mothers of children below age 3 with different ethnic/racial background could benefit from anticipatory guidance. Structural equation modeling results showed that across ethnic/racial groups, guidance was directly associated with decreased maternal stress and directly and indirectly associated with effective parenting practices in child development, discipline, and safety...
December 5, 2016: Western Journal of Nursing Research
https://www.readbyqxmd.com/read/27920245/underlying-influence-of-perception-of-management-leadership-on-patient-safety-climate-in-healthcare-organizations-a-mediation-analysis-approach
#17
Shao-Jen Weng, Seung-Hwan Kim, Chieh-Liang Wu
OBJECTIVE: We aim to draw insights on how medical staff's perception of management leadership affects safety climate with key safety related dimensions-teamwork climate, job satisfaction and working conditions. DESIGN/SETTING: A cross-sectional survey using Safety Attitude Questionnaire (SAQ) was performed in a medical center in Taichung City, Taiwan. The relationships among the dimensions in SAQ were then analyzed by structural equation modeling with a mediation analysis...
December 4, 2016: International Journal for Quality in Health Care
https://www.readbyqxmd.com/read/27919395/measuring-patient-trust-in-telemedicine-services-development-of-a-survey-instrument-and-its-validation-for-an-anticoagulation-web-service
#18
Lex van Velsen, Monique Tabak, Hermie Hermens
BACKGROUND: For many eServices, end-user trust is a crucial prerequisite for use. For the telemedicine context however, knowledge about the coming about and measurement of end-user trust is scarce. OBJECTIVE: To develop and validate the PAtient Trust Assessment Tool (PATAT): a survey instrument to quantitatively assess patient trust in a telemedicine service. METHODS: Informed by focus groups, we developed a survey that includes measurement scales for the following factors: trust in the care organization, care professional, treatment, and technology, as well as a scale that assesses a holistic view on trust in the telemedicine service...
January 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/27919381/consumer-choice-of-on-demand-mhealth-app-services-context-and-contents-values-using-structural-equation-modeling
#19
Euehun Lee, Semi Han, Sang Hyun Jo
OBJECTIVE: As smartphone penetration increases and the technology advances, various mobile services have reached the market. mHealth Applications are specifically highlighted for phenomena such as global aging & well-being, but the technology-driven mHealth services have not been successful in the market because consumer needs have not been reflected in the services properly. This study developed a research model consisting of context/contents values to explain the intention of consumers over the age of 40 in using mHealth Applications...
January 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/27919303/mental-illness-stigma-and-suicidality-the-role-of-public-and-individual-stigma
#20
N Oexle, T Waldmann, T Staiger, Z Xu, N Rüsch
AIMS: Suicide rates are increased among unemployed individuals and mental illness stigma can contribute to both unemployment and suicidality. Persons with mental illness perceive negative attitudes among the general public and experience discrimination in their everyday life (=public stigma components) potentially leading to self-stigma and anticipated discrimination (=individual stigma components). Previous research found evidence for an association between aspects of mental illness stigma and suicidality, but has not yet clarified the underlying pathways explaining how different stigma components interact and contribute to suicidal ideation...
December 6, 2016: Epidemiology and Psychiatric Sciences
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