Fernando Massa
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View article: A Bayesian Non-Linear Mixed-Effects Model for Accurate Detection of the Onset of Cognitive Decline in Longitudinal Aging Studies
A Bayesian Non-Linear Mixed-Effects Model for Accurate Detection of the Onset of Cognitive Decline in Longitudinal Aging Studies Open
Change-point models are frequently considered when modeling phenomena where a regime shift occurs at an unknown time. In aging research, these models are commonly adopted to estimate of the onset of cognitive decline. Yet these models pres…
View article: Enhancing rice (Oryza sativa L.) yield prediction with sequential climatic data: a case of study in Uruguay
Enhancing rice (Oryza sativa L.) yield prediction with sequential climatic data: a case of study in Uruguay Open
Effective planning and decision-making for rice (Oryza sativa L.) cultivation require precise yield predictions. Thus, new prediction strategies that incorporate climatic effects and management variables are essential to bridge the gap bet…
View article: A Bayesian Non-linear Mixed-Effects Model for Accurate Detection of the Onset of Cognitive Decline in Longitudinal Aging Studies
A Bayesian Non-linear Mixed-Effects Model for Accurate Detection of the Onset of Cognitive Decline in Longitudinal Aging Studies Open
Change-point models are frequently considered when modeling phenomena where a regime shift occurs at an unknown time. In ageing research, these models are commonly adopted to estimate of the onset of cognitive decline. Yet commonly used mo…
View article: Global cognitive function and allostatic load in older adults living in rural Ecuador: insights from the EcuAging study
Global cognitive function and allostatic load in older adults living in rural Ecuador: insights from the EcuAging study Open
Background Evidence about the association between global cognitive function and allostatic load, a measure of cumulative wear and tear resulting from chronic stress and life events, in older adults living in rural areas of Latin America is…
View article: Longitudinal Quantiles of Frailty Trajectories Considering Death: New Insights into Sex and Cohort Differences in the Reference Curves for Frailty Progression of Older European
Longitudinal Quantiles of Frailty Trajectories Considering Death: New Insights into Sex and Cohort Differences in the Reference Curves for Frailty Progression of Older European Open
Background Most previous studies of frailty trajectories in older adults focus on the average trajectory and ignore death. Longitudinal quantile analysis of frailty trajectories permits the definition of reference curves, and the applicati…
View article: Prospective ECUAging Observational study: cohort design and preliminary results
Prospective ECUAging Observational study: cohort design and preliminary results Open
Background : The global phenomenon of increasing older adult populations is evident across diverse societies, including historically youthful middle- and low-income countries. Conducting population-specific research in low- and middle-inco…
View article: New Evidence of Healthier Aging: Positive Cohort Effects on Verbal Fluency
New Evidence of Healthier Aging: Positive Cohort Effects on Verbal Fluency Open
Background and Objectives Cross-sectional studies have shown improvements in cognition in later-born cohorts. However, it remains unclear whether these cohort effects extend beyond cognitive levels and are also detectable in the rate of ag…
View article: Status of carnitine and circulating amino acids and its association with pre-frailty, sarcopenia and diet in an Uruguayan older population
Status of carnitine and circulating amino acids and its association with pre-frailty, sarcopenia and diet in an Uruguayan older population Open
BACKGROUND: Frailty is a clinical-biological syndrome in older adults that carries an increased risk for poor health outcomes. Biomarkers of disability are being studied and some acylcarnitines and amino acids are part of the predictive mo…
View article: Periodontitis prevalence and associated factors: a comparison of two examination protocols
Periodontitis prevalence and associated factors: a comparison of two examination protocols Open
The fact that there are different epidemiological definitions of periodontitis and different evaluation protocols affects the estimate of periodontitis prevalence and of the influence of associated factors. The gold standard for periodonta…
View article: Modelos de regresión binaria y de modelos de conteo para Caries en una encuesta poblacional
Modelos de regresión binaria y de modelos de conteo para Caries en una encuesta poblacional Open
Introducción: En este trabajo se presenta una situación muy frecuente en el ámbito de la Epidemiologı́a, como es el trabajar con variables de respuesta en escala cuantitativa, las que se dicotomizan para un determinado umbral, y usar modelo…
View article: Epidemiología de la enfermedad periodontal en adultos uruguayos. Análisis de sus factores asociados individuales y contextuales. Estudio poblacional en Uruguay
Epidemiología de la enfermedad periodontal en adultos uruguayos. Análisis de sus factores asociados individuales y contextuales. Estudio poblacional en Uruguay Open
Hasta el año 2011, Uruguay no contaba con datos a nivel nacional sobre enfermedad periodontal, desarrollándose ese año el “Primer relevamiento nacional en salud bucal en población joven y adulta uruguaya 2010-2011”. Para el estudio de la e…
View article: Creación de indicadores alternativos para la vigilancia en salud oral mediante Regresión Beta
Creación de indicadores alternativos para la vigilancia en salud oral mediante Regresión Beta Open
En el ámbito de la Epidemiologı́a y Salud Pública, pueden existir limitaciones en los indicadores generalmente utilizados ya que muchas veces no toman en cuenta la estructurada multivariada de la información o si la toman, lo hacen a través…
View article: Análisis y desarrollo de nuevas variables electromiográficas y refleximétricas para el estudio de la función cráneo-mandibular
Análisis y desarrollo de nuevas variables electromiográficas y refleximétricas para el estudio de la función cráneo-mandibular Open
El estudio de los fenómenos electrofisiológicos y el desarrollo de técnicas que permitan comprender mejor la fisiopatología del sistema estomatognático, han sido motivo de numerosos estudios desde hace varias décadas. Sin embargo y a pesar…
View article: Prevalencia de signos y síntomas de trastornos temporomandibulares en una población joven al inicio y al final del tratamiento por drogodependencia
Prevalencia de signos y síntomas de trastornos temporomandibulares en una población joven al inicio y al final del tratamiento por drogodependencia Open
Introducción: El consumo de drogas puede ser agente etiológico de trastornos témporomandibulares (TTM). Trabajos previos de tipo transversal confirman esta hipótesis en poblaciones específicas. Objetivos: estimar la prevalencia de signos y…
View article: Identificación de tipologıa de pobreza multidimensional a través del enfoque de cluster probabilıstico (Identification of typology of multidimensional poverty through the probabilistic cluster approach)
Identificación de tipologıa de pobreza multidimensional a través del enfoque de cluster probabilıstico (Identification of typology of multidimensional poverty through the probabilistic cluster approach) Open
The measurement and characterization of poverty is a topic of social interest that is statistically it can be approached from different perspectives. By using using Factorial Analysis and/or Cluster Analysis techniques, partitions were def…
View article: NEW EVIDENCE OF HEALTHIER AGING. POSITIVE COHORT EFFECT ON COGNITIVE DECLINE
NEW EVIDENCE OF HEALTHIER AGING. POSITIVE COHORT EFFECT ON COGNITIVE DECLINE Open
Cross sectional studies have shown cohort effects in cognition, limited research exists about cohort effects on cognitive trajectories. Indeed, most longitudinal research conducted to study aging-related cognitive change focus on the assoc…
View article: SEX DIFFERENCES AND LONGITUDINAL QUANTILES OF FRAILTY TRAJECTORIES WITH MISSING DATA DUE TO DEATH
SEX DIFFERENCES AND LONGITUDINAL QUANTILES OF FRAILTY TRAJECTORIES WITH MISSING DATA DUE TO DEATH Open
Scarce evidence exists about frailty trajectories, but the evidence suggests that women live longer with higher levels of frailty. When progression of frailty was studied, the focus has been on mean trajectories and research has ignored de…
View article: Salud bucal como derecho ciudadano y su relación con la prevención de enfermedades no transmisibles
Salud bucal como derecho ciudadano y su relación con la prevención de enfermedades no transmisibles Open
The right to health in Uruguay is enshrined in the Constitution of the Republic and law 18211 of the National Integrated Health System (SNIS). However, the health of young people between 15 and 24 years old is a worrying issue. The most pr…
View article: Montevideo journey-to-work flows, 2016: A doubly constrained gravity model with random effects
Montevideo journey-to-work flows, 2016: A doubly constrained gravity model with random effects Open
In this study, a doubly constrained gravity model was estimated using generalised linear mixed-effects models for journey-to-work flows in Montevideo, Uruguay.Under the mixed-models framework, Poisson and negative binomial regression model…
View article: Hamstring Torque, Velocity and Power Elastic Band Measurements during Hip Extension and Knee Flexion
Hamstring Torque, Velocity and Power Elastic Band Measurements during Hip Extension and Knee Flexion Open
The quantitative dynamic monitoring of the performance of hamstring muscles during rehabilitation and training cannot currently be undertaken using elastic resistance bands. Hip extension with a fully extended knee involves hamstring agoni…
View article: Impacto del número de controles periódicos en la salud bucal de los pacientes atendidos en la Clínica de Odontopediatría
Impacto del número de controles periódicos en la salud bucal de los pacientes atendidos en la Clínica de Odontopediatría Open
"Objetivo: Evaluar la asociación del número de controles y la salud bucal de niños entre 5 y 10 años. Estudio transversal, descriptivo (2017-18) y retrospectivo (hasta 2014) en dos subpoblaciones: G1=controles y G2=primera vez, evaluando d…
View article: MODELOS DE CONTEO ALTERNATIVOS PARA LOS COMPONENTES DEL CPO EN UNA ENCUESTA DE SALUD BUCAL EN MONTEVIDEO, URUGUAY
MODELOS DE CONTEO ALTERNATIVOS PARA LOS COMPONENTES DEL CPO EN UNA ENCUESTA DE SALUD BUCAL EN MONTEVIDEO, URUGUAY Open
Actualmente existen varios indicadores de las diferentes dimensiones que se determinan a nivel individual en salud oral desde una perspectiva epidemiológica. Dentro de los que corresponden a la patología Caries se consideran entonces los i…
View article: Cognitive Dispersion Predicts Grip Strength Trajectories in Men but not Women in a Sample of the Oldest Old Without Dementia
Cognitive Dispersion Predicts Grip Strength Trajectories in Men but not Women in a Sample of the Oldest Old Without Dementia Open
Background and Objectives Grip strength is a reliable marker of biological vitality and it typically demonstrates an expected decline in older adults. According to the common-cause hypothesis, there is also a significant association betwee…
View article: Cpo-grama: una herramienta de visualización a través del análisis de datos composicionales para la estructura multivariante de los componentes del cpo
Cpo-grama: una herramienta de visualización a través del análisis de datos composicionales para la estructura multivariante de los componentes del cpo Open
In the epidemiological studies in Oral Health that analyze the components of the DMF (carious dental pieces, per- sealed and closed), it is usual to do it separately, which leads to a loss of relevant information that is contained in the m…
View article: Salud Bucal y Enfermedades no transmisibles en pacientes de un centro de enseñanza universitaria del área Salud, Montevideo-Uruguay. Parte 2
Salud Bucal y Enfermedades no transmisibles en pacientes de un centro de enseñanza universitaria del área Salud, Montevideo-Uruguay. Parte 2 Open
"Objetivo: determinar la prevalencia de caries, paradenciopatías y pérdida dentaria en personas que demandan atención en la facultad de odontología de la udelar.Metodos: se relevó una muestra de los pacientes de la facultad de odontología,…
View article: Aplicación de técnicas de clustering para la elaboración de perfiles epidemiológicos en estudios sanitarios
Aplicación de técnicas de clustering para la elaboración de perfiles epidemiológicos en estudios sanitarios Open
In the context of epidemiological studies, where non-communicable \ndiseases (NCDs) are investigated, it is common practice the use of categorical \nvariables to reflect the presence of both certain diseases and comorbidities or risk \nfac…
View article: Salud Bucal y Enfermedades no transmisibles en pacientes de un centro de enseñanza universitaria, Montevideo-Uruguay. Parte 1
Salud Bucal y Enfermedades no transmisibles en pacientes de un centro de enseñanza universitaria, Montevideo-Uruguay. Parte 1 Open
"Objetivo: Determinar la prevalencia ENT y sus factores de riesgo conductuales y metabólicos en personas que concurrieron a la Facultad de Odontología de la Universidad de la República.Metodos: Estudio transversal en el que se aplicó un cu…
View article: Do I lose cognitive function as fast as my twin partner? Analyses based on classes of MMSE trajectories of twins aged 80 and older
Do I lose cognitive function as fast as my twin partner? Analyses based on classes of MMSE trajectories of twins aged 80 and older Open
Background Aging is associated with an increasing risk of decline in cognitive abilities. The decline is, however, not a homogeneous process. There are substantial differences across individuals although previous investigations have identi…
View article: Do I Lose Cognitive Function as Fast as my Twin Partner? Analyses Based on Classes of MMSE Trajectories of Twins Aged 80 and older
Do I Lose Cognitive Function as Fast as my Twin Partner? Analyses Based on Classes of MMSE Trajectories of Twins Aged 80 and older Open
Background: Aging is associated with an increasing risk of decline in cognitive abilities. The decline is, however, not a homogeneous process. There are substantial differences across individuals although previous investigations have ident…
View article: Modeling in an oral health study through two statistical methods in Uruguay
Modeling in an oral health study through two statistical methods in Uruguay Open
In epidemiological studies it is common practice to work with binary variables that reflect the presence of certain diseases, which in turn may be associated with another set of variables, that in general are assumed as risk factors of the…