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Search Results: 1 - 10 of 297818 matches for " Rubén; Téllez-Rojo "
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Peak bone mass and bone mineral density correlates for 9 to 24 year-old Mexican women, using corrected BMD
Torres-Mejía,Gabriela; Guzmán Pineda,Rubén; Téllez-Rojo,Martha María; Lazcano-Ponce,Eduardo;
Salud Pública de México , 2009, DOI: 10.1590/S0036-36342009000700011
Abstract: objective: to determine the age of peak bone mass (pbm) in mexican women and factors associated with both bmda and corrected bmd (bmdcorr) at the femoral neck and the spine (l2-l4). material and methods: data on 461 women between 9 and 24 years old was used. an interview was performed and height and weight were measured. bmda was measured by a densitometer and bmdcorr by the method proposed by kr?ger et al. (1992). results: pbm at the spine (l2-l4) was observed later than at the femoral neck. both bmda and bmdcorr at the lumbar spine correlate with age, socio-economic status, body fat percentage and height. bmda at the femoral neck correlates with overweight and obesity, body fat percentage, height and moderate physical activity; the same variables were associated with bmdcorr except for height. conclusions: the method proposed by kr?ger et al. was more precise at the femoral neck than at the spine.
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.
Dise?o mixto de evaluación de la iniciativa Salud Mesoamérica 2015
Gutiérrez,Juan Pablo; Téllez-Rojo,Marta María; Torres,Pilar; Romero,Martín; Bertozzi,Stefano M;
Salud Pública de México , 2011, DOI: 10.1590/S0036-36342011000900012
Abstract: since the salud mesoamerica 2015 initiative (sm-2015) aim is to improve health and nutrition conditions of those most vulnerable in mesoamerica, the goal of the evaluation is to generate evidence of the joint effectiveness of a package of interventions designed to improve the health conditions. we propose a mix design for the evaluation, which will allow to know the magnitude of changes attributable to the interventions, as well as the meanings of these changes for the target population, taking into account the specificities of each country. the main axis of this design is a locality panel where information about individuals, households, and health facilities (first and second level) will also be collected. the evaluation design described in this paper was developed between june and december, 2009, and it was integrated during workshops in cuernavaca (mexico), managua (nicaragua), and san jose (costa rica). the proposed design will allow to generate evidence about the joint effectiveness of the package of interventions proposed for the sm-2015. the success of this design rests on the political commitment of countries and donors.
Pobreza, jóvenes y consumo de tabaco en México
Reddy-Jacobs,Carl; Téllez-Rojo,Martha Ma.; Meneses-González,Fernando; Campuzano-Rincón,Julio; Hernández-ávila,Mauricio;
Salud Pública de México , 2006, DOI: 10.1590/S0036-36342006000700010
Abstract: objective: to characterize tobacco use according to level of poverty in a random, nationally representative sample of adolescents (10 to 21 years old), living in urban areas with less than 50 000 inhabitants. the study was done in 2001 as part of the baseline assessment of the evaluation of the governmental program, oportunidades. material and methods: a questionnaire was applied to 29 548 adolescents living in 30 000 selected households and it included specific questions on individual tobacco use among other questions. results: the prevalence of smokers was 3.5% (95% ci: 3.3%-3.7%) and experimenters 9.9% (95% ci: 9.6%-10.2%). a logistic regression model for clustered data was constructed in order to evaluate the associated factors that distinguish a smoker from an experimenter. after adjusting for level of poverty of the household and use of alcohol and drugs, a significant association (or = 1.5, p <0.01) was found with having a paid job and a differential association was found between gender and age group. conclusions: the results of this study suggest that the additional availability of money that an adolescent has, could increase the prevalence of tobacco smoking and that the program oportunidades should include prevention campaigns directed specifically at this population group.
Relación entre consultas a urgencias por enfermedad respiratoria y contaminación atmosférica en Ciudad Juárez, Chihuahua
Hernández-Cadena,Leticia; Téllez-Rojo,Martha Ma.; Sanín-Aguirre,Luz Helena; Lacasa?a-Navarro,Marina; Campos,Armando; Romieu,Isabelle;
Salud Pública de México , 2000, DOI: 10.1590/S0036-36342000000400003
Abstract: objective: to assess the relationship of £10 μm particles (pm10) and atmospheric ozone concentrations, with the daily number of emergency visits due to asthma and acute respiratory diseases, among children aged under 15, living in ciudad juarez, chihuahua, mexico. material and methods: between 1998 and 1999, an ecologic study was conducted. atmospheric data were obtained from the environmental protection agency (epa), from eight monitoring stations located in ciudad juarez, chihuahua, and el paso, texas. from july 1997 to december 1998, data from emergency room visits for respiratory illness were abstracted from existing medical records of two mexican institute of social security (imss) hospitals in ciudad juarez. diagnoses were classified into two groups: a) asthma, and b) upper respiratory infections (uri), according to the international classification of diseases (icd-9 and/or idc-10). statistical analysis was carried out using the poisson regression time series method. results: during the study period, the mean 24-hour pm10 level was 34.46 μg/m3 (sd=17.99) and the mean ozone level was 51.60 ppb (sd=20.70). the model shows that an increase of 20 μg/m3 in the mean 24-hour exposure to pm10 was related to an increase of 4.97% (95% ci 0.97-9.13) in emergency visits for asthma, with a 5-day lag, as well as to an increase of 9% (95% ci 1.8-16.8) when a cumulative 5-day exposure was considered. uri increased 2.95% as a cause of emergency room visits, for each 20 μg/m3 increase in the mean 24-hour exposure to pm10. the impact of pm10 on emergency visits for asthma was greater on days with ozone ambient levels exceeded 49 ppb (median value). conclusions: a positive association was found between environmental pm10 and ozone concentrations and the daily number of emergency room visits due to asthma and acute respiratory diseases, even with levels lower than the mexican standard levels. also, a synergic effect between pm10 and o3 was found.
Prevalencia de asma y otras enfermedades alérgicas en ni?os escolares de Ciudad Juárez, Chihuahua
Barraza-Villarreal,Albino; Sanín-Aguirre,Luz Helena; Téllez-Rojo,Martha María; Lacasa?a-Navarro,Marina; Romieu,Isabelle;
Salud Pública de México , 2001, DOI: 10.1590/S0036-36342001000500007
Abstract: objective. to assess the prevalence and severity of asthma and allergic diseases in schoolchildren residing in ciudad juarez, chihuahua. material and methods. a cross-sectional study was conducted from april 1998 to may 1999, among 6 174 children from 53 schools in ciudad juarez, chihuahua. the method used was the one recommended by the international study of asthma and allergies in childhood (isaac) to determine the prevalence and severity of asthma, rhinitis, and eczema. parents were asked to answer a standardized questionnaire on current and cumulative prevalence of asthma, rhinitis, and eczema. a sample stratified by level of pollution was selected. results. the cumulative prevalence of medically diagnosed asthma and wheezing was 6.8% (95% ci 6.2, 7.4) and 20% (95% ci 19.7, 21.8), respectively. the prevalence of wheezing in the last 12 months was higher in the group aged 6-8 years than in those aged 11-14 years (9.7% vs. 5.8 %, p<0.01). the prevalence of medically diagnosed rhinitis was 5.0 % (95% ci 4.5, 5.6). the prevalence of medically diagnosed eczema was 4.9% (4.3, 5.4). the prevalence of eczema symptoms in the last 12 months was 12.7% in the 6-8 years group and 13.3% in the 11-14 year group, respectively. severe symptoms of asthma were significantly higher in the 6-8 years group and during the autumn months. conclusions. the prevalence of medically diagnosed and symptomatic asthma was relatively low in comparison with findings from others studies that use similar methods, but the prevalence rates of rhinitis and eczema were higher.
Relación entre consultas a urgencias por enfermedad respiratoria y contaminación atmosférica en Ciudad Juárez, Chihuahua
Hernández-Cadena Leticia,Téllez-Rojo Martha Ma.,Sanín-Aguirre Luz Helena,Lacasa?a-Navarro Marina
Salud Pública de México , 2000,
Abstract: OBJETIVO: Analizar la relación entre las concentraciones ambientales de partículas de diámetro <=10 μm (PM10) y de ozono con el número diario de consultas al servicio de urgencias por enfermedades respiratorias agudas y asma en ni os menores de 15 a os, residentes de Ciudad Juárez, Chihuahua, México. MATERIAL Y MéTODOS: Este estudio se realizó durante los a os de 1998 y 1999, utilizando un dise o de tipo ecológico. Los datos atmosféricos se obtuvieron de la base de datos de la Agencia de Protección al Ambiente (EPA), provenientes de ocho estaciones de monitoreo ubicadas en Ciudad Juárez y en El Paso, Texas. Los datos de consultas al servicio de urgencias por causas respiratorias se obtuvieron de los registros médicos de dos hospitales del Instituto Mexicano del Seguro Social (IMSS), en Ciudad Juárez, Chihuahua, de julio de 1997 a diciembre de 1998. Los diagnósticos se clasificaron en dos grupos: a) asma, y b) infecciones respiratorias altas, conforme a la Clasificación Internacional de Enfermedades (CIE-9 o CIE-10). El análisis se realizó con la utilización de la metodología de series de tiempo que emplea regresión Poisson. RESULTADOS: Durante el periodo de estudio la media de 24 horas de PM10 fue de 34.46 μg/m3 (DE=17.99) y la media de los niveles de ozono fue de 51.60 partes por billón (ppb) (DE=20.70). El modelo propuesto estima que un incremento de 20 μg/m3 en el promedio de 24 horas, en la exposición a PM10, se relaciona con un incremento de 4.97% (IC 95% 0.97-9.13) en las consultas por asma con un retraso de cinco días y con un incremento de 9% (IC 95% 1.8-16.8) cuando se considera a la exposición acumulada de cinco días anteriores. Respecto a enfermedades respiratorias altas se encontró un aumento de 2.95% en las consultas a urgencias por cada 20 μm/m3 de incremento en el promedio de 24 horas en la exposición a PM10. Se observó que el impacto de PM10 sobre las visitas de urgencia por asma fue más severo en los días en que los niveles de ozono excedían los 49 ppb (nivel de la mediana) en el ambiente. CONCLUSIONES: Se encontraron asociaciones positivas entre las concentraciones de PM10 y el número de consultas por asma y enfermedades respiratorias aun cuando los niveles alcanzados no excedían las normas ambientales mexicanas. Asimismo, se detectó un efecto sinérgico entre ozono y PM10.
Prevalencia de asma y otras enfermedades alérgicas en ni os escolares de Ciudad Juárez, Chihuahua
Barraza-Villarreal Albino,Sanín-Aguirre Luz Helena,Téllez-Rojo Martha María,Lacasa?a-Navarro Marina
Salud Pública de México , 2001,
Abstract: Objetivo. Determinar la prevalencia y severidad del asma, de la rinitis y del eczema en escolares. Material y métodos. Estudio transversal efectuado entre abril de 1998 y mayo de 1999 en Ciudad Juárez, Chihuahua, México, a una muestra aleatoria de 6 174 ni os de 53 escuelas. Se aplicó la metodología propuesta por el International Study of Asthma and Allergies in Childhood (ISAAC) (etapas 1 y 2) para determinar la prevalencia y severidad del asma, rinitis y eczema. La información de prevalencia, tanto actual como acumulada para dichos padecimientos, se obtuvo mediante un cuestionario ya estandarizado y contestado por los padres de los ni os. El dise o de la muestra se hizo por un muestreo mixto, en el cual se estratificó por nivel de contaminación ambiental. Se estimaron prevalencias actual y acumulada estratificando por grupo de edad, sexo, área e historia familiar de asma. Resultados. La prevalencia acumulada de asma por diagnóstico médico y sibilancia (silbidos) fue de 6.8% (IC95% 6.2-7.4) y 20.% (IC95% 19.7-21.8), respectivamente; la prevalencia de sibilancia en los últimos 12 meses fue mayor en el grupo de 6-8 a os que en el de 11-14 a os(9.7%) contra 5.8% (p<0.01). La prevalencia de rinitis por diagnóstico médico fue de 5.0% (IC95% 4.5-5.6). La prevalencia de eczema por diagnóstico médico fue de 4.9% (IC95% 4.3-5.4). La prevalencia de síntomas de eczema en los últimos 12 meses fue de 12.7% en el grupo de 6-8 a os y de 13.3% en el de 11-14 a os. Los síntomas severos de asma fueron significativamente más prevalentes en el grupo de 6-8 a os y en los meses de oto o. Conclusiones. La prevalencia de asma, tanto por diagnóstico médico como por síntomas, resulta relativamente baja en relación con otros estudios realizados con la misma metodología, pero las prevalencias de rinitis y eczema fueron altas. El texto completo en inglés de este artículo está disponible en: http://www.insp.mx/salud/index.html
HFE Gene Variants Modify the Association between Maternal Lead Burden and Infant Birthweight: A Prospective Birth Cohort Study in Mexico City, Mexico
David Cantonwine, Howard Hu, Martha Téllez-Rojo, Brisa N Sánchez, Héctor Lamadrid-Figueroa, Adrienne S Ettinger, Adriana Mercado-García, Mauricio Hernández-Avila, Robert O Wright
Environmental Health , 2010, DOI: 10.1186/1476-069x-9-43
Abstract: We investigated the role of HFE C282Y, HFE H63 D, and transferrin (TF) P570 S gene variants in modifying the association of lead and infant birthweight in a cohort of Mexican mother-infant pairs. Subjects were initially recruited between 1994-1995 from three maternity hospitals in Mexico City and 411 infants/565 mothers had archived blood available for genotyping. Multiple linear regression models, stratified by either maternal/infant HFE or TF genotype and then combined with interaction terms, were constructed examining the association of lead and birthweight after controlling for covariates.3.1%, 16.8% and 17.5% of infants (N = 390) and 1.9%, 14.5% and 18.9% of mothers (N = 533) carried the HFE C282Y, HFE H63D, and TF P570 S variants, respectively. The presence of infant HFE H63 D variants predicted 110.3 g (95% CI -216.1, -4.6) decreases in birthweight while maternal HFE H63 D variants predicted reductions of 52.0 g (95% CI -147.3 to 43.2). Interaction models suggest that both maternal and infant HFE H63 D genotype may modify tibia lead's effect on infant birthweight in opposing ways. In our interaction models, maternal HFE H63 D variant carriers had a negative association between tibia lead and birthweight.These results suggest that the HFE H63 D genotype modifies lead's effects on infant birthweight in a complex fashion that may reflect maternal-fetal interactions with respect to the metabolism and transport of metals.Decreased birthweight has been established as a predictor of infant mortality, morbidity, developmental outcomes such as cognitive performance, and chronic disease into adulthood [1]. Both environmental and genetic factors contribute to the weight of an infant at birth. Environmental factors that have been associated with birth weight include, but are not limited to: maternal nutritional status [2], maternal infections [3], parity, and exposure to toxicants, such as lead [4]. Two recent population studies have estimated that approximately 50% of t
Bisphenol a exposure in Mexico City and risk of prematurity: a pilot nested case control study
David Cantonwine, John D Meeker, Howard Hu, Brisa N Sánchez, Héctor Lamadrid-Figueroa, Adriana Mercado-García, Gamola Z Fortenberry, Antonia M Calafat, Martha Téllez-Rojo
Environmental Health , 2010, DOI: 10.1186/1476-069x-9-62
Abstract: A nested case-control subset of 60 participants in the Early Life Exposure in Mexico to ENvironmental Toxicants (ELEMENT) study in Mexico City, Mexico were selected based on delivering less than or equal to 37 weeks of gestation and greater than 37 weeks of gestation. Third trimester archived spot urine samples were analyzed by online solid phase extraction coupled with high performance liquid chromatography isotope dilution tandem mass spectrometry.BPA was detected in 80.0% (N = 48) of the urine samples; total concentrations ranged from < 0.4 μg/L to 6.7 μg/L; uncorrected geometric mean was 1.52 μg/L. The adjusted odds ratio of delivering less than or equal to 37 weeks in relation to specific gravity adjusted third trimester BPA concentration was 1.91 (95%CI 0.93, 3.91, p-value = 0.08). When cases were further restricted to births occurring prior to the 37th week (n = 12), the odds ratio for specific-gravity adjusted BPA was larger and statistically significant (p < 0.05).This is the first study to document measurable levels of BPA in the urine of a population of Mexican women. This study also provides preliminary evidence, based on a single spot urine sample collected during the third trimester, that pregnant women who delivered less than or equal to 37 weeks of gestation and prematurely (< 37 weeks) had higher urinary concentrations of BPA compared to women delivering after 37 weeks.Bisphenol A (BPA, CAS no. 80-05-7) is produced in high volume worldwide for use in a variety of industrial and consumer products, such as epoxy resins used to line food cans [1], polyester-styrene [2], and polycarbonate plastics which make up some baby bottles and other containers [3]. Due to this wide spread usage, the primary exposure route in humans is thought to occur via ingestion of food or water [4,5]. Calafat et al. documented extensive exposure to the general US population in a subset of the 2003-2004 National Health and Nutrition Examination Survey (NHANES), where 93% of the
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