A5045235381- Statistical Methods and Bayesian Inference
- Child Abuse and Trauma
- Respiratory and Cough-Related Research
- Opioid Use Disorder Treatment
- Substance Abuse Treatment and Outcomes
- Prenatal Substance Exposure Effects
- Cardiac Arrest and Resuscitation
- Child and Adolescent Psychosocial and Emotional Development
- Musculoskeletal pain and rehabilitation
- Genetic Associations and Epidemiology
- Pharmaceutical industry and healthcare
- Bayesian Methods and Mixture Models
- Pain Management and Opioid Use
- Medication Adherence and Compliance
- Pharmaceutical Practices and Patient Outcomes
- Asthma and respiratory diseases
- Atrial Fibrillation Management and Outcomes
- Occupational Health and Performance
- Health Systems, Economic Evaluations, Quality of Life
- Emergency and Acute Care Studies
- Venous Thromboembolism Diagnosis and Management
- Health disparities and outcomes
- Childhood Cancer Survivors' Quality of Life
- Pediatric Pain Management Techniques
- Balance, Gait, and Falls Prevention
University of Pittsburgh Medical Center
2012-2024
University of Florida
2021-2024
University of Pittsburgh
2013-2023
Florida College
2023
Park University
2023
Carnegie Mellon University
2001-2022
University of Alabama
2022
Jones College
2021
University of Washington
2019-2021
Western Pennsylvania Hospital
2019
This article introduces a new SAS procedure written by the authors that analyzes longitudinal data (developmental trajectories) fitting mixture model. The TRAJ fits semiparametric (discrete) mixtures of censored normal, Poisson, zero-inflated and Bernoulli distributions to data. Applications psychometric scale data, offense counts, dichotomous prevalence measure in violence research are illustrated. In addition, use Bayesian information criterion address problem model selection, including...
This article is a follow-up to Jones, Nagin, and Roeder (2001), which described an SAS procedure for estimating group-based trajectory models. Group-based specialized application of finite mixture modeling designed identify clusters individuals following similar progressions some behavior or outcome over age time. has two purposes. One summarize extensions the methodology that have been developed since Jones et al. The other illustrate how lends itself presentation findings in form easily...
Group-based trajectory models are used to investigate population differences in the developmental courses of behaviors or outcomes. This note introduces a new Stata command, traj, for fitting longitudinal data finite (discrete) mixture designed identify clusters individuals following similar progressions some behavior outcome over age time. Normal, Censored normal, Poisson, Zero-inflated and Logistic distributions supported.
Identifying and monitoring multiple disease biomarkers other clinically important factors affecting the course of a disease, behavior or health status is great clinical relevance. Yet conventional statistical practice generally falls far short taking full advantage information available in multivariate longitudinal data for tracking outcome interest. We demonstrate method called multi-trajectory modeling that designed to overcome this limitation. The generalization group-based trajectory...
<b><i>Objective:</i></b> To determine if abnormalities exist in postural control autism and they are related to age. <b><i>Methods:</i></b> Dynamic posturography was performed 79 autistic individuals without mental retardation 61 healthy volunteers between ages 5 52 years. Both the sensory organization movement coordination portions of test were performed. <b><i>Results:</i></b> The subjects had reduced stability (<i>p</i> = 0.002). Examination age effects revealed that development delayed...
Myocardial extravascular extracellular volume fraction (Ve) measures quantify diffuse fibrosis not readily detectable by conventional late gadolinium (Gd) enhancement (LGE). Ve measurement requires steady state equilibrium between plasma and interstitial Gd contrast. While a constant infusion produces state, it is unclear whether simple bolus can do the same. Given relatively slow clearance of Gd, we hypothesized that technique accurately Ve, thus facilitating integration myocardial...
OBJECTIVE. We examined whether mild traumatic brain injuries in children and adolescents, especially when associated with acute clinical features reflecting more severe injury, result different postinjury trajectories of postconcussive symptoms compared orthopedic injuries. PARTICIPANTS AND METHODS. Participants this prospective longitudinal cohort study were 8- to 15-year-old children, 186 99 injuries, who recruited from consecutive admissions emergency departments 2 large children's...
This article reports on an extension of group-based trajectory modeling to address nonrandom participant attrition or truncation due death that varies across groups. The effects the model are explored in both simulated and real data. analyses data establish estimates group size as measured by membership probabilities can be badly biased differential rates groups if initially not well separated. Differential also imply sizes will change over time, which turn has important implications for...
Abstract Purpose: The purpose of this study was to apply group-based trajectory analysis identify multiple successful aging trajectories by indicators and examine the factors related among elderly population in Taiwan. Design Methods: Nation-representative longitudinal data collected from 1993 2007 consisting 2 cohorts were used, following 6 analyzed: chronic diseases, physical function difficulties, depressive symptoms, social support, participation, economic satisfaction. Results: Members...
Group-based trajectory models are used to investigate population differences in the developmental courses of behaviors or outcomes . This article demonstrates a new Stata command, traj, for fitting longitudinal data finite (discrete) mixture designed identify clusters individuals following similar progressions some behavior outcome over age time. Censored normal, Poisson, zero-inflated and Bernoulli distributions supported. Applications psychometric scale data, count dichotomous prevalence...
The aim of the study was to investigate heterogeneity temporal patterns vasomotor symptoms (VMS) over menopausal transition and identify factors associated with these in a diverse sample women.The Study Women's Health Across Nation is multisite longitudinal women from five racial/ethnic groups transitioning through menopause. analytic included 1,455 nonsurgical menopause median follow-up 15.4 years. Temporal VMS associations serum estradiol follicle-stimulating hormone, race/ethnicity, body...
Childhood sexual abuse (CSA) has been associated with HIV/AIDS risk behavior; however, much of this work is retrospective and focuses on women. The current study used semi-parametric mixture modeling youth (n = 844; 48.8% boys) from the Longitudinal Studies Child Abuse Neglect (LONGSCAN) to examine link between trajectories CSA (2 12 years old) behavior at age 14 (i.e., intercourse & alcohol use). Trajectory analyses revealed a history development risky behavior. In addition, for physical...
Although a number of cross-sectional studies document the distress experienced by partners and caregivers cancer survivors, few have considered their potential differential patterns adjustment over time. Identify distinct trajectories anxiety depression among survivors predictors these trajectories. Participants completed survey to examine impact caring for, or living with, survivor at 6, 12, 24 months post-survivor diagnosis. Anxiety were measured using Hospital Depression Scale (Nanxiety =...
To determine the association between local environmental factors with child weight status in a longitudinal study, using semi-parametric, group-based method, while also considering social and early life factors.Standardized, directly measured BMI from 4-10 y of age, trajectory modeling (PROC TRAJ) were used to estimate developmental trajectories change Québec birth cohort (n = 1,566). Associations living location, cohesion, disorder, material deprivation estimated after controlling for...
The course of cognitive aging has demonstrated substantial heterogeneity. This study attempted to identify distinctive trajectories and examine their relationship with burdens disability, hospitalization, nursing home admission. Seven hundred fifty-four community-living persons aged 70 years or older in the Yale Precipitating Events Project were assessed Mini-Mental State Examination every 18 months for up 108 months. A group-based trajectory model was used determine while adjusting age,...
Abstract Purpose Little is known about the longitudinal patterns of buprenorphine adherence among pregnant women with opioid use disorder, especially when late initiation, nonadherence, or early discontinuation during pregnancy may increase risk adverse outcomes. We aimed to identify distinct trajectories pregnancy, and factors associated these in Medicaid‐enrolled women. Methods A retrospective cohort study included 2361 Pennsylvania Medicaid enrollees aged 15 46 having therapy a live birth...
Developmental trajectories of risky sexual behavior were identified in a multiethnic sample 1,121 youth drawn from the Children National Longitudinal Survey Youth data set (NLSY79). Group-based trajectory modeling composite index risk taking revealed four groups ages 16 to 22: low risk, decreasing increasing and high risk. The Low Risk group exhibited levels across study period. Decreasing had adolescence that declined early adulthood. Increasing High showed distinct patterns during but...
The authors examined the effect of psychosocial and clinical variables on treatment response trajectory in elderly patients with major depressive disorder. Three studies provided data 360 depressed subjects who participated protocols using either nortriptyline or paroxetine as monotherapy or, 2 studies, combined interpersonal psychotherapy. Treatment was assessed Hamilton Rating Scale for Depression-17 Item (HRSD-17) score over 12 weeks acute each study. mixture-modeling method analysis used...