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https://www.readbyqxmd.com/read/29164351/latent-class-symptom-profiles-of-selective-mutism-identification-and-linkage-to-temperamental-and-social-constructs
#1
Rachele Diliberto, Christopher A Kearney
Selective mutism (SM) is a stable, debilitating psychiatric disorder in which a child fails to speak in most public situations. Considerable debate exists as to the typology of this population, with empirically-based studies pointing to possible dimensions of anxiety, oppositionality, and communication problems, among other aspects. Little work has juxtaposed identified symptom profiles with key temperamental and social constructs often implicated in SM. The present study examined a large, diverse, non-clinical, international sample of children aged 6-10 years with SM to empirically identify symptom profiles and to link these profiles to key aspects of temperament (i...
November 21, 2017: Child Psychiatry and Human Development
https://www.readbyqxmd.com/read/29164222/strain-stiffening-gels-based-on-latent-crosslinking
#2
Yen H Tran, Matthew J Rasmuson, Todd Emrick, John Klier, Shelly R Peyton
Gels represent an increasingly important class of soft materials with applications ranging from regenerative medicine to commodity materials. However, gels typically exhibit relative mechanical weakness, which worsens under repeated strain. Here we report a new class of responsive gels with latent crosslinking moieties that exhibit strain-stiffening behavior. This property results from the lability of disulfides, initially isolated in a protected state, then activated to crosslink on-demand. The thiol groups are induced to form inter-chain crosslinks when subjected to mechanical compression, resulting in a gel that strengthens under strain...
November 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/29161837/effect-of-seasonality-on-the-dynamics-of-an-imitation-based-vaccination-model-with-public-health-intervention
#3
Bruno Buonomo, Giuseppe Carbone, Alberto d'Onofrio
We extend here the game-theoretic investigation made by d'Onofrio et al (2012) on the interplay between private vaccination choices and actions of the public health system (PHS) to favor vaccine propensity in SIR-type diseases. We focus here on three important features. First, we consider a SEIR--type disease. Second, we focus on the role of seasonal fluctuations of the transmission rate. Third, by a simple population--biology approach we derive - with a didactic aim - the game theoretic equation ruling the dynamics of vaccine propensity, without employing 'economy--related' concepts such as the payoff...
February 1, 2018: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/29159404/variation-in-the-12-month-treatment-trajectories-of-children-and-adolescents-after-a-diagnosis-of-depression
#4
Nina R Joyce, Megan S Schuler, Scott E Hadland, Laura A Hatfield
Importance: Depression during childhood and adolescence is heterogeneous. Treatment patterns are often examined in aggregate, yet there is substantial variability across individual treatment trajectories. Understanding this variability can help identify treatment gaps among youths with depression. Objective: To characterize heterogeneity in 12-month trajectories of psychotherapy and antidepressant treatment in youths with depression. Design, Setting, and Participants: This is a longitudinal-cohort study of youths 18 years or younger with a new diagnosis of depression and at least 12 months of follow-up following diagnosis, as determined from commercial insurance claims filed from 2007 to 2014...
November 20, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/29158406/transcriptome-wide-characterization-of-human-cytomegalovirus-in-natural-infection-and-experimental-latency
#5
Shu Cheng, Katie Caviness, Jason Buehler, Megan Smithey, Janko Nikolich-Žugich, Felicia Goodrum
The transcriptional program associated with herpesvirus latency and the viral genes regulating entry into and exit from latency are poorly understood and controversial. Here, we developed and validated a targeted enrichment platform and conducted large-scale transcriptome analyses of human cytomegalovirus (HCMV) infection. We used both an experimental hematopoietic cell model of latency and cells from naturally infected, healthy human subjects (clinical) to define the breadth of viral genes expressed. The viral transcriptome derived from experimental infection was highly correlated with that from clinical infection, validating our experimental latency model...
November 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29157370/bayesian-estimation-of-true-prevalence-sensitivity-and-specificity-of-three-diagnostic-tests-for-detection-of-escherichia-coli-o157-in-cattle-feces
#6
Pius S Ekong, Michael W Sanderson, Nora M Bello, Lance W Noll, Natalia Cernicchiaro, David G Renter, Jianfa Bai, T G Nagaraja
Cattle are a reservoir for Escherichia coli O157 and they shed the pathogen in their feces. Fecal contaminants on the hides can be transferred onto carcasses during processing at slaughter plants, thereby serving as a source of foodborne infection in humans. The detection of E. coli O157 in cattle feces is based on culture, immunological, and molecular methods We evaluated the diagnostic sensitivity and specificity of one culture- and two PCR-based tests for the detection of E. coli O157 in cattle feces, and its true prevalence using a Bayesian implementation of latent class models...
December 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/29156415/patterns-of-food-and-physical-activity-environments-related-to-children-s-food-and-activity-behaviors-a-latent-class-analysis
#7
Robin S DeWeese, Punam Ohri-Vachaspati, Marc A Adams, Jonathan Kurka, Seung Yong Han, Michael Todd, Michael J Yedidia
Relationships between food and physical activity (PA) environments and children's related behaviors are complex. Latent class analyses derived patterns from proximity to healthy and unhealthy food outlets, PA facilities and parks, and counts of residential dwellings and intersections. Regression analyses examined whether derived classes were related to food consumption, PA, and overweight among 404 low-income children. Compared to children living in Low PA-Low Food environments, children in High Intersection&Parks-Moderate Density&Food, and High Density-Low Parks-High Food environments, had significantly greater sugar-sweetened beverage consumption (ps<0...
November 17, 2017: Health & Place
https://www.readbyqxmd.com/read/29156414/schizophrenia-heterogeneity-revisited-clinical-cognitive-and-psychosocial-correlates-of-statistically-derived-negative-symptoms-subgroups
#8
Anthony O Ahmed, Gregory P Strauss, Robert W Buchanan, Brian Kirkpatrick, William T Carpenter
Traditional efforts to delineate the clinical heterogeneity of schizophrenia have been unsuccessful because of the absence of a valid, stable, and meaningful subtyping scheme. A clinically-informed nosology supported by multivariate statistical classification methods may provide a better approach for classifying schizophrenia. The goals of the current study were to 1) use multivariate classification methods to validate a clinical subtyping scheme based on the profile of negative symptoms; and 2) following validation to contrast the statistically-derived subgroups to ascertain distinguishing demographic, clinical, cognitive, and functional characteristics...
November 12, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29153759/shared-heart-failure-knowledge-and-self-care-outcomes-in-patient-caregiver-dyads
#9
Julie T Bidwell, Melinda K Higgins, Carolyn M Reilly, Patricia C Clark, Sandra B Dunbar
BACKGROUND: Patient's knowledge about heart failure (HF) contributes to successful HF self-care, but less is known about shared patient-caregiver knowledge. OBJECTIVES: The purpose of this analysis was to: 1) identify configurations of shared HF knowledge in patient-caregiver dyads; 2) characterize dyads within each configuration by comparing sociodemographic factors, HF characteristics, and psychosocial factors; and 3) quantify the relationship between configurations and patient self-care adherence to managing dietary sodium and HF medications...
November 15, 2017: Heart & Lung: the Journal of Critical Care
https://www.readbyqxmd.com/read/29152811/a-latent-class-analysis-of-online-sexual-experiences-and-offline-sexual-behaviors-among-female-adolescents
#10
Megan K Maas, Bethany C Bray, Jennie G Noll
This study used latent class analysis to identify patterns (i.e., classes) across a broad range of online sexual experiences among female adolescents (n = 312) and to explore offline sexual behavior and substance use correlates of as well as maltreatment differences in class membership. The following four classes were identified: Online Abstinent, Online Inclusive, Attractors, and Seekers. Maltreated female adolescents were more likely to be members of the Online Inclusive class and less likely to be members of the Online Abstinent class than nonmaltreated female adolescents...
November 20, 2017: Journal of Research on Adolescence: the Official Journal of the Society for Research on Adolescence
https://www.readbyqxmd.com/read/29152032/latent-class-modeling-using-matrix-covariates-with-application-to-identifying-early-placebo-responders-based-on-eeg-signals
#11
Bei Jiang, Eva Petkova, Thaddeus Tarpey, R Todd Ogden
Latent class models are widely used to identify unobserved subgroups (i.e., latent classes) based upon one or more manifest variables. The probability of belonging to each subgroup is typically modeled as a function of a set of measured covariates. In this paper, we extend existing latent class models to incorporate matrix covariates. This research is motivated by a randomized placebo-controlled depression clinical trial. One study goal is to identify a subgroup of subjects who experience symptoms improvement early on during antidepressant treatment, which is considered to be an indication of a placebo rather than a true pharmacological response...
September 2017: Annals of Applied Statistics
https://www.readbyqxmd.com/read/29151574/machine-learning-meets-complex-networks-via-coalescent-embedding-in-the-hyperbolic-space
#12
Alessandro Muscoloni, Josephine Maria Thomas, Sara Ciucci, Ginestra Bianconi, Carlo Vittorio Cannistraci
Physicists recently observed that realistic complex networks emerge as discrete samples from a continuous hyperbolic geometry enclosed in a circle: the radius represents the node centrality and the angular displacement between two nodes resembles their topological proximity. The hyperbolic circle aims to become a universal space of representation and analysis of many real networks. Yet, inferring the angular coordinates to map a real network back to its latent geometry remains a challenging inverse problem...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29151404/the-causes-of-school-failure-in-secondary-school-students-validation-of-a-psychosocial-model-with-structural-equations
#13
Fernando Chacón Fuertes, Carlos A Huertas Hurtado
The objective of the study was to determine the causal effects of school failure (SF) among secondary school students, belonging to five public schools within the region of Girardota, Colombia, through the validation of a psychosocial model with structural equations. A total of 319 students, 25% more males, enrolled in classes between 6th and 11th year, with an average age of 14 years. Furthermore, 265 parents and 200 teachers were also included in the sample. Participants answered the questions raised in 9 instruments...
November 20, 2017: Spanish Journal of Psychology
https://www.readbyqxmd.com/read/29150817/two-step-estimation-of-models-between-latent-classes-and-external-variables
#14
Zsuzsa Bakk, Jouni Kuha
We consider models which combine latent class measurement models for categorical latent variables with structural regression models for the relationships between the latent classes and observed explanatory and response variables. We propose a two-step method of estimating such models. In its first step, the measurement model is estimated alone, and in the second step the parameters of this measurement model are held fixed when the structural model is estimated. Simulation studies and applied examples suggest that the two-step method is an attractive alternative to existing one-step and three-step methods...
November 17, 2017: Psychometrika
https://www.readbyqxmd.com/read/29150814/detecting-multiple-random-changepoints-in-bayesian-piecewise-growth-mixture-models
#15
Eric F Lock, Nidhi Kohli, Maitreyee Bose
Piecewise growth mixture models are a flexible and useful class of methods for analyzing segmented trends in individual growth trajectory over time, where the individuals come from a mixture of two or more latent classes. These models allow each segment of the overall developmental process within each class to have a different functional form; examples include two linear phases of growth, or a quadratic phase followed by a linear phase. The changepoint (knot) is the time of transition from one developmental phase (segment) to another...
November 17, 2017: Psychometrika
https://www.readbyqxmd.com/read/29145944/latent-national-subpopulations-of-early-education-classroom-disengagement-of-children-from-underresourced-families
#16
Paul A McDermott, Michael J Rovine, Marley W Watkins, Jessica L Chao, Clare W Irwin, Roland Reyes
This research examined the latent developmental patterns for early classroom disengagement among children from some of the most underresourced families in the nation. Based on standardized teacher observations from the Head Start Impact Study, a nationally representative sample of children (N=1377) was assessed for manifestations of reticent/withdrawn and low energy behavior over four years spanning prekindergarten through first grade. For each form of disengagement, latent growth mixture modeling revealed three distinct subpopulations of change patterns featuring a dominant class associated with generally good classroom adjustment, a medial class that varied close to the population average over time, and a more extreme class (about 10% of the population) whose adjustment was relatively marginal and sometimes reached problematic levels...
December 2017: Journal of School Psychology
https://www.readbyqxmd.com/read/29145902/-the-20-year-longitudinal-trajectories-of-social-functioning-in-individuals-with-psychotic-disorders
#17
M Oorschot, A K J Fett, E Velthorst
OBJECTIVE: Social impairment is a long-recognized core feature of schizophrenia and is common in other psychotic disorders. Still, to date the long-term trajectories of social impairment in psychotic disorders have rarely been studied systematically. METHODS: Data came from the Suffolk County Mental Health Project, a 20-year prospective study of first-admission patients with psychotic disorders. A never-psychotic comparison group was also assessed. Latent class growth analysis was applied to longitudinal data on social functioning from 485 respondents with schizophrenia spectrum disorders and psychotic mood disorders, and associations of the empirically derived trajectories with premorbid social adjustment, diagnosis, and 20-year outcomes were examined...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29145171/host-target-based-approaches-against-arboviral-diseases
#18
Rebeca Froes Rocha, Juliana Lemos Del Sarto, Rafael Elias Marques, Vivian Vasconcelos Costa, Mauro Martins Teixeira
In the 20th century, socioeconomic and environmental changes facilitated the reintroduction of mosquitoes in developing cities, resulting in the reintroduction of mosquito-borne viral diseases and the dispersal of their causative agents in a worldwide scale. Recurrent outbreaks of arboviral diseases are being reported, even in regions without a previous history of arboviral disease transmission. Of note, arboviral infections represented approximately 30% of all emerging vector-borne diseases of the last decade...
November 27, 2017: Biological Chemistry
https://www.readbyqxmd.com/read/29143486/violent-behaviour-in-early-psychosis-patients-can-we-identify-clinical-risk-profiles
#19
Valerie Moulin, Julie Palix, Philippe Golay, Alexandre Dumais, Mohammad Mehdi Gholamrezaee, Agathe Azzola, Philipp S Baumann, Luis Alameda, Philippe Conus
AIMS: The objective of this study is to explore, within a sample of early psychosis patients (EPP), if subgroups regarding rate of violent behaviour (VB) against others can be identified on the basis of dynamic risk factors (treatment modifiable characteristics). METHODS: In a sample of 265 EPP, treated at the Treatment and Early Intervention in Psychosis Program in Lausanne, we conducted a latent-class analysis on the basis of the main dynamic VB risk factors (substance use disorder [SUD], positive symptoms, insight, and impulsivity)...
November 15, 2017: Early Intervention in Psychiatry
https://www.readbyqxmd.com/read/29143385/patterns-of-allergic-sensitization-and-atopic-dermatitis-from-1-to-3-years-effects-on-allergic-diseases
#20
C Dharma, D L Lefebvre, M M Tran, W Y W Lou, P Subbarao, A B Becker, P J Mandhane, S E Turvey, M R Sears
BACKGROUND: While allergic sensitization and atopic dermatitis (AD) are known to increase the risk for allergic diseases, the impact of different temporal and clinical patterns of sensitization and AD is less well defined. OBJECTIVE: We investigated patterns of sensitization and AD from early infancy to age 3, and the differential risk for developing allergic diseases within each pattern in a general cohort. METHODS: Children (n=2629) from the Canadian Healthy Infant Longitudinal Development (CHILD) Study underwent skin prick tests and were assessed clinically for AD at ages 1 and 3 years...
November 16, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
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