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Search Results: 1 - 10 of 215571 matches for " Aarón Salinas-Rodríguez "
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Modelos de regresión para variables expresadas como una proporción continua
Salinas-Rodríguez,Aarón; Pérez-Nú?ez,Ricardo; ávila-Burgos,Leticia;
Salud Pública de México , 2006, DOI: 10.1590/S0036-36342006000500006
Abstract: objective: to describe some of the statistical alternatives available for studying continuous proportions and to compare them in order to show their advantages and disadvantages by means of their application in a practical example of the public health field. material and methods: from the national reproductive health survey performed in 2003, the proportion of individual coverage in the family planning program -proposed in one study carried out in the national institute of public health in cuernavaca, morelos, mexico (2005)- was modeled using the normal, gamma, beta and quasi-likelihood regression models. the akaike information criterion (aic) proposed by mcquarrie and tsai was used to define the best model. then, using a simulation (monte carlo/markov chains approach) a variable with a beta distribution was generated to evaluate the behavior of the 4 models while varying the sample size from 100 to 18 000 observations. results: results showed that the best statistical option for the analysis of continuous proportions was the beta regression model, since its assumptions are easily accomplished and because it had the lowest aic value. simulation evidenced that while the sample size increases the gamma, and even more so the quasi-likelihood, models come significantly close to the beta regression model. conclusions: the use of parametric beta regression is highly recommended to model continuous proportions and the normal model should be avoided. if the sample size is large enough, the use of quasi-likelihood model represents a good alternative.
Impacto del Seguro Popular en el gasto catastrófico y de bolsillo en el México rural y urbano, 2005-2008
Sosa-Rubí,Sandra G; Salinas-Rodríguez,Aarón; Galárraga,Omar;
Salud Pública de México , 2011, DOI: 10.1590/S0036-36342011001000006
Abstract: objective. to estimate the effect of "seguro popular" (sp) on the incidence of catastrophic health expenditure (che) and out-of-pocket (oop) health expenditure in the medium term. material and methods. we used the 'encuesta de evaluación del sp' -sp survey evaluation- (2005-2008). we analyzed the sp effect on the rural cohort during two years of follow-up (2006 and 2008) and in the urban cohort during one year of follow-up (2008). results. at the local level (regional clusters) we did not find an effect of the sp. at the household level we found a protective effect of sp on che and the oop health payments in outpatient and hospitalization in rural areas; and a significant effect on the reduction of oop health payments in outpatient services in urban zones. conclusions. sp seems to be an effective program to protect poor household against out-of-pocket health expenditures in the medium term.
Análisis estadístico para datos de conteo: aplicaciones para el uso de los servicios de salud
Salinas-Rodríguez,Aarón; Manrique-Espinoza,Betty; Sosa-Rubí,Sandra G;
Salud Pública de México , 2009, DOI: 10.1590/S0036-36342009000500007
Abstract: objective: to describe some of the statistical models for the study of count variables in the context of the use of health services. material and methods: we used the seguro popular evaluation survey to estimate the effect of seguro popular on the frequency of use of outpatient health services, using poisson regression models and negative binomial, zero-inflated negative binomial and the hurdle negative binomial models. we used the akaike information criterion (aic) to define the best model. results: results show that the best statistical approach to model the use of health services is the hurdle model, taking into account both the main theoretical assumptions and the statistical results of the aic. discussion: the modelling of count data requires the application of statistical models to model data dispersion; in the presence of an excess of zeros, the hurdle model is an appropriate statistical option.
Prevalencia de dependencia funcional y su asociación con caídas en una muestra de adultos mayores pobres en México
Manrique-Espinoza,Betty; Salinas-Rodríguez,Aarón; Moreno-Tamayo,Karla; Téllez-Rojo,Martha M;
Salud Pública de México , 2011, DOI: 10.1590/S0036-36342011000100005
Abstract: objective: to determine the prevalence of functional dependency (fd) on mexican elderly living in extreme poverty conditions and to estimate the association between falls and fd. material and methods: a survey was conducted with three stages for selection, stratified by type of locality (rural or urban) and nationally representative of the 2006 oportunidades program. the target population was composed of individuals 70 years of age and older who were beneficiaries of the oportunidades program. results: a total of 30.9% of the elderly presented fd. the gender stratified logistic regression model resulted in an odds ratio (or) for women of 1.25 (i.c:1.13-1.39) for the association between the increase in the number of falls and fd and or=1.12 (i.c:0.97-1.29) for men. conclusions: given the vulnerable conditions in which these older adults live, specific interventions need to be implemented to prevent falls in order to reduce the risk of functional dependency.
Identifica o dos usuários segundo nível de satisfa o nos módulos gerontológicos empregando a análise de conglomerados Identificación de los pacientes según nivel de satisfacción en módulos gerontológicos empleando el análisis de conglomerados Identification of users using cluster analysis according to degree of satisfaction with geriatric care services
Gustavo Nigenda-López,Aarón Salinas-Rodríguez,Mariana Gómez-Camponovo,Betty Manrique-Espinoza
Revista da Escola de Enfermagem da USP , 2013,
Abstract: Esta pesquisa teve como objetivos identificar os grupos de usuários segundo o grau de satisfa o com a aten o recebida nos Módulos Gerontológicos e determinar os principais fatores associados. Trata-se de estudo transversal realizado com 181 usuários nos 36 módulos do Seguro Social dos Trabalhadores Públicos, no México. O nível de satisfa o foi avaliado segundo três aspectos: características gerais da aten o recebida, amabilidade no trato e infraestrutura. Foi realizada uma análise de conglomerados para identificar grupos de usuários segundo o grau de satisfa o e um modelo de regress o logística ordinal para identificar os fatores associados. Estiveram satisfeitos com o servi o 53% dos usuários; medianamente satisfeitos, 34,3%; e insatisfeitos, 12,7%. Os principais fatores associados com maior grau de satisfa o foram: ser mulher, maior idade e ser chefe/a de família. O sistema de saúde deve dirigir sua aten o para esse grupo populacional que é crescente e incentivar o desenvolvimento de uma aten o de qualidade que contemple as suas necessidades. Se objetivó identificar grupos de usuarios según grado de satisfacción con la atención recibida en Módulos Gerontológicos, y determinar los principales factores asociados. Estudio transversal, muestra de 181 pacientes de los 36 módulos del Seguro Social de Trabajadores Estatales, en México. El nivel de satisfacción fue evaluado bajo tres aspectos: características generales de la atención recibida; amabilidad en el trato e infraestructura. Se realizó análisis de conglomerados para identificar grupos de pacientes según grado de satisfacción y un modelo de regresión logística ordinal para identificar factores asociados. Resultaron satisfechos con el servicio 53% de los pacientes; medianamente satisfechos 34,3% e insatisfechos 12,7%. Los principales factores asociados a mayor grado de satisfacción fueron: ser mujer, mayor edad, ser jefe/a de familia. El sistema de salud debe dirigir su atención a este grupo poblacional creciente, e incentivar el desarrollo de una atención calificada que contemple sus necesidades. The aim of this study was to identify groups of users according to their degree of satisfaction with geriatric care services and determine the primary factors associated with satisfaction. This was a cross-sectional study of 181 people enrolled in 36 modules pertaining to the State Workers Social Security Institute (ISSSTE) in Mexico. Degree of satisfaction was measured according to the following three areas: general characteristics of services offered, friendliness of staff and infrastructure. A clu
Early Impact of a National Multi-Faceted Road Safety Intervention Program in Mexico: Results of a Time-Series Analysis
Aruna Chandran, Ricardo Pérez-Nú?ez, Abdulgafoor M. Bachani, Martha Híjar, Aarón Salinas-Rodríguez, Adnan A. Hyder
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087482
Abstract: Background In January 2008, a national multifaceted road safety intervention program (IMESEVI) funded by the Bloomberg Philanthropies was launched in Mexico. Two years later in 2010, IMESEVI was refocused as part of a 10-country international consortium demonstration project (IMESEVI/RS10). We evaluate the initial effects of each phase of the road safety intervention project on numbers of RT crashes, injuries and deaths in Mexico and in the two main target cities of Guadalajara-Zapopan and León. Methods An interrupted time series analysis using autoregressive integrated moving average (ARIMA) modeling was performed using monthly data of rates of RT crashes and injuries (police data), as well as deaths (mortality system data) from 1999–2011 with dummy variables representing each intervention phase. Results In the period following the first intervention phase at the country level and in the city of León, the rate of RT crashes decreased significantly (p<0.05). Notably, following the second intervention phase although there was no reduction at the country level, there has been a decrease in the RT crash rate in both Guadalajara-Zapopan (p = 0.029) and in León (p = 0.029). There were no significant differences in the RT injury or death rates following either intervention phase in either city. Conclusion These initial results suggest that a multi-faceted road safety intervention program appears to be effective in reducing road crashes in a middle-income country setting. Further analysis is needed to differentiate the effects of various interventions, and to determine what other economic and political factors might have affected this change.
Depressive symptoms among poor older adults in Mexico: prevalence and associated factors
Bojorquez-Chapela,Ietza; Villalobos-Daniel,Victor E.; Manrique-Espinoza,Betty S.; Tellez-Rojo,Martha M.; Salinas-Rodríguez,Aarón;
Revista Panamericana de Salud Pública , 2009, DOI: 10.1590/S1020-49892009000700011
Abstract: objective: to describe the presence of depressive symptoms (ds) and factors associated with them among poor mexican older male and female adults (oa). methods: a survey was conducted among oa enrolled in a governmental poverty relief program (oportunidades) in mexico. participants completed a short version of the center for epidemiologic studies depression scale and answered questions about health and life conditions. results: the prevalence of ds over the cutoff point was 43% (confidence interval (ci) 39.5-46.4). ds were associated with different variables among male and female participants. for men, difficulties in performing daily life activities were associated with ds over the cutoff point (odds ratio (or) 2.62, ci 1.58-4.34) and literacy was associated with less ds (or 0.46, ci 0.31-0.68). for women, difficulties with daily life activities were associated with more ds (or 2.50, ci 1.57-3.97), and being head of the family was also positively associated (or 1.81, ci 1.11-2.93). conclusions: ds were frequent among this sample of poor oa. the differences between men and women in variables associated with ds highlight the importance of considering the gendered aspects of growing old.
Polydispersity Effects in the Dynamics and Stability of Bubbling Flows
E. Salinas-Rodríguez,R. F. Rodríguez,J. M. Zamora,A. Soria
Physics , 2005, DOI: 10.1140/epjb/e2006-00128-7
Abstract: The occurrence of swarms of small bubbles in a variety of industrial systems enhances their performance. However, the effects that size polydispersity may produce on the stability of kinematic waves, the gain factor, mean bubble velocity, kinematic and dynamic wave velocities is, to our knowledge, not yet well established. We found that size polydispersity enhances the stability of a bubble column by a factor of about 23% as a function of frequency and for a particular type of bubble column. In this way our model predicts effects that might be verified experimentally but this, however, remain to be assessed. Our results reinforce the point of view advocated in this work in the sense that a description of a bubble column based on the concept of randomness of a bubble cloud and average properties of the fluid motion, may be a useful approach that has not been exploited in engineering systems.
Ríos de la reserva de la biosfera El Triunfo, un diagnóstico para su restauración ecológica
Salinas-Rodríguez, Sergio Alberto;Ramírez-Marcial, Neptalí;
Hidrobiológica , 2010,
Abstract: in recent years the rivers in "el triunfo" biosphere reserve (rebitri) and its influence area have increased their riverbanks in width because of high precipitation events, resulting in economic and human losses in the states of chiapas and tabasco. the objective of the present work was to identify, characterize, and diagnose five river sections to assess their ecological status inside of this natural area. multicriterion analysis was performed to define the sampling rivers sections; to quantify its changes and dynamism, were characterized geomorphological and hydrologically, and the gis analysis was complete through an aerial photos comparison to obtain composition and configuration index of each riparian landscape patch. the results indicate that the response of these rivers sections is mainly influenced by lack of tree cover on slopes. plant cover is essential to retain and absorb much water as product of the surface runoff on the slopes. therefore, the hydrological restoration projects must consider the tree cover reestablishment to balance erosion and sediment process relationship.
Modelo Hidrodinámico para la Velocidad de un Par de Burbujas Ascendiendo en Línea
Ramírez-Mu?oz,Jorge; Soria,Alberto; Salinas-Rodríguez,Elizabeth;
Información tecnológica , 2007, DOI: 10.4067/S0718-07642007000400010
Abstract: a hydrodynamic analysis on the interaction of two equal-size spherical bubbles aligned on the direction of a uniform, laminar, newtonian and incompressible flow, is presented. the leading bubble is considered as an isolated bubble and the trailing bubble (second bubble) is subjected to four forces: buoyancy, quasisteady drag, fluid impulse and added mass. by applying a force balance on each bubble, an expression for the rising velocity of the trailing bubble was obtained. comparison of this expression with existing experimental data for 3.06, 21.5 and 35.4 reynolds number was performed, obtaining a relative average error between 1.2% and 2.1%. two possible approaches on the trailing bubble drag reduction effect are discussed. it was found that a quasisteady drag is, by itself, unable to incorporate the whole wake effect on the trailing bubble.
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