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Search Results: 1 - 10 of 541349 matches for " TéLLES-ROJO MARTHA MARíA "
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Efecto de la contaminación ambiental sobre las consultas por infecciones respiratorias en ni os de la Ciudad de México
TéLLES-ROJO MARTHA MARíA,ROMIEU ISABELLE,POLO-PE?A MARCO,RUIZ-VELASCO SILVIA
Salud Pública de México , 1997,
Abstract: Objetivo. Modelar la variabilidad en el número de consultas infantiles diarias por motivos respiratorios como consecuencia de los cambios diarios en los niveles de contaminación ambiental, observada en los servicios de urgencias y medicina familiar de un hospital de especialidades del Instituto Mexicano del Seguro Social ubicado en la zona suroeste de la Ciudad de México durante 1993. Material y métodos. Se estudió la correlación entre la presencia de infecciones respiratorias altas y bajas con la exposición a ozono y bióxido de nitrógeno. Para modelar esta asociación se utilizó la técnica de regresión Poisson aplicada sobre modelos de riesgo lineal y no lineal con periodos de latencia entre las mediciones ambientales y la consulta de uno, dos y tres días, así como el promedio de las mediciones de los tres, cinco y siete días previos a la consulta. Resultados. El modelo utilizado estima que un incremento de 50 ppb en el promedio horario de ozono de un día ocasionaría, al día siguiente, un incremento del 9.9% en las consultas de urgencias por infecciones respiratorias altas en el periodo invernal, pudiendo incrementarse hasta en un 30% si el incremento se diera en cinco días consecutivos como promedio. Conclusiones. Los resultados sugieren que la exposición de los menores de 15 a os al ozono y bióxido de nitrógeno inciden significativamente sobre el número de consultas ocasionadas por motivos respiratorios en esta zona de la Ciudad de México.
Efecto de la contaminación ambiental sobre las consultas por infecciones respiratorias en ni?os de la Ciudad de México
TéLLES-ROJO,MARTHA MARíA; ROMIEU,ISABELLE; POLO-PE?A,MARCO; RUIZ-VELASCO,SILVIA; MENESES-GONZáLEZ,FERNANDO; HERNáNDEZ-AVILA,MAURICIO;
Salud Pública de México , 1997, DOI: 10.1590/S0036-36341997000600004
Abstract: objective. to model the variability of medical visits by children for respiratory reasons as a consequence of the daily changes in environmental pollution observed in the emergency and family medicine departments of a hospital of the instituto mexicano del seguro social located in the southwest of mexico city during 1993. materials and methods. the correlation between the presence of upper and lower respiratory tract infections and exposure to ozone and nitrogen dioxide was studied. to model this association, the authors used multivariate poisson regression models with linear and non-linear risk, with lag periods between the environmental measurements and the medical visits of one, two and three days, as well as the average of the measurements of three, five and seven days previous to the visit. results. the model estimates that an increment of 50 ppb in the daily average of ozone would cause an increase of 9.9% in emergency visits due to high respiratory tract infections during the winter, which could rise to 30% if the increment would last five consecutive days in average. conclusions. results suggest that exposure of children younger than 15 years of age to ozone and nitrogen dioxide significantly affect the number of medical visits for respiratory causes in this part of mexico city.
Efecto del tabaquismo durante el embarazo sobre la antropometría al nacimiento
Sánchez-Zamorano,Luisa María; Téllez-Rojo,Martha María; Hernández-Avila,Mauricio;
Salud Pública de México , 2004, DOI: 10.1590/S0036-36342004000600008
Abstract: objective: to assess the effect of tobacco consumption during pregnancy on height and birth weight of newborns. material and methods: two cohort studies on lead exposure conducted in mexico city between 1993 and 2000 were analyzed. data were analyzed to assess the differences in height and birth weight between children of women who smoked during pregnancy and those who did not, adjusting for other important factors. statistical analysis consisted of multiple linear regression models. results: the proportion of women who smoked during pregnancy was 4.7%. the birth weight of children of mothers who smoked during pregnancy was 154 grams less on average (95% confidence interval [ci] -284.7, -24.7) and their height was 0.79 cm less (95% ci -1.5, -0.1) than the children of non-smokers during pregnancy. conclusions: these findings evidence the deleterious effect of tobacco consumption on children.
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 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.
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
Exposición al plomo y su relación con el tiempo requerido para embarazo
Guerra-Tamayo Juan Luis,Hernández-Cadena Leticia,Téllez-Rojo Martha María,Mercado-García Adriana del S
Salud Pública de México , 2003,
Abstract: OBJETIVO: Determinar los efectos de la exposición al plomo relacionados con el tiempo requerido para embarazo. MATERIAL Y MéTODOS: Entre 1997 y 2001 se realizó un estudio en 142 mujeres residentes en la Ciudad de México, participantes en un estudio de cohorte para evaluar diversos efectos del plomo sobre la salud reproductiva. Se realizaron mediciones de plomo en sangre y en hueso a cada una de las participantes en el momento de ingresar al estudio, y se obtuvo información relativa a la exposición y otras variables de interés a través de un cuestionario. A cada una de las participantes se les siguió hasta el momento en que se embarazaron, o bien, hasta el tiempo de término del estudio, con el propósito de determinar la asociación entre la exposición al plomo y el tiempo requerido para quedar embarazada. El análisis estadístico se llevó a cabo utilizando curvas de Kaplan-Meier y modelos de riesgos proporcionales de Cox. RESULTADOS: Del total de mujeres que iniciaron el estudio se embarazaron 42, de las cuales 34 lo lograron antes del primer a o de seguimiento y ocho posteriormente. Las medias de las concentraciones de plomo en sangre fueron de 9.3 μg/dl; en rótula y tibia fueron de 16.0 y 11.0 μg Pb/g de hueso mineral, respectivamente. No se detectaron diferencias en los niveles de plomo en sangre respecto al tiempo que durante el estudio requirió la mujer para embarazarse en el primer a o; no obstante, se encontró que en las mujeres con plomo en sangre por encima de 10 μg/dl el riesgo de no embarazo fue cinco veces mayor [IC 95% (1.9-19.1)] después de un a o de seguimiento, comparado con aquellas mujeres con plomo en sangre por debajo de 10 μg/dl. CONCLUSIONES: La exposición a concentraciones altas de plomo puede ser un factor de riesgo importante en el tiempo requerido para que una mujer quede embarazada, principalmente en aquellas que siendo fértiles tienen periodos mayores de un a o buscando un embarazo.
Encuesta Nacional de Cobertura de Vacunación (influenza, neumococo y tétanos) en adultos mayores de 60 a?os en México
Trejo-Valdivia,Belem; Mendoza-Alvarado,Laura R; Palma-Coca,Oswaldo; Hernández-ávila,Mauricio; Téllez-Rojo Solís,Martha María;
Salud Pública de México , 2012, DOI: 10.1590/S0036-36342012000100006
Abstract: objective: determine vaccination coverage (vc) among adults 60 years of age and older (ep), for influenza, pneumococcal and tetanus vaccines, association with socio-demographic characteristics and heterogeneity at state level. material and methods: cross-sectional analysis based on information from 18 015 households visited in a national survey. general and vaccine information (self-report) for a randomly selected elder in each household is available. results: the national vc level was found to be 56.5% (±0.97) for influenza, 44.3% (±0.98) for pneumococcus and 61.8% (±0.96) for tetanus. the vc was significantly lower for ep without health social services and higher for women. almost 20.0% of ep recognized not having vaccines at all, due mainly that they didn't know it was a duty. conclusions: important improvements are shown in vaccination coverage among elderly in mexico. differentials suggest the need to intensify information campaigns and actions that could improve the accessibility to vaccines for this population.
Exposición al plomo y su relación con el tiempo requerido para embarazo
Guerra-Tamayo,Juan Luis; Hernández-Cadena,Leticia; Téllez-Rojo,Martha María; Mercado-García,Adriana del S; Solano-González,Maritsa; Hernández-Avila,Mauricio; Hu,Howard;
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000800004
Abstract: objective: to determine the effects of lead exposure on the time elapsed to become pregnant. material and methods: the study population consisted of 142 women residing in mexico city between 1997 and 2001, who were already participating in a study to evaluate effects of lead exposure on reproductive health. measurements of lead in bone were performed when women were first admitted to the program. information on lead exposure and other variables of interest was obtained through a questionnaire. participants were followed up to assess the relationship between the time required to become pregnant and lead exposure. statistical analysis consisted of kaplan-meier estimates and cox proportional hazards models. results: of the total number of women in the program, 42 got pregnant: 34 before the first year of follow-up, and 8 at a later date. the mean value for lead concentration in blood was 9.3 μg/dl. the mean values for lead concentration in patella and tibia were 16.0 y 11.0 μg pb/g of bone, respectively. survival analysis was performed and no differences were detected in blood lead levels and time to pregnancy in the first year. nevertheless, in women with blood lead levels above 10.0 μg/dl, the likelihood of not achieving pregnancy was five times higher (95% confidence interval [ci] 0.05-0.56) after one year of follow-up compared with women with blood lead levels below 10.0 μg/dl. conclusions: exposure to high lead concentrations may be an important risk factor influencing the time period for a woman to get pregnant, especially in fertile women who have tried to get pregnant for more than a year.
Contaminación atmosférica, asma bronquial e infecciones respiratorias agudas en menores de edad, de La Habana
Romero-Placeres,Manuel; Más-Bermejo,Pedro; Lacasa?a-Navarro,Marina; Rojo-Solís,Martha María Téllez; Aguilar-Valdés,Juan; Romieu,Isabelle;
Salud Pública de México , 2004, DOI: 10.1590/S0036-36342004000300012
Abstract: objective: to identify the relationship between emergency visits for acute respiratory illnesses, acute bronchial asthma crisis (abac) and acute respiratory infections (ari), in children less than 14 years of age, and the daily changes of air pollutant levels, in two central hospitals of havana city, between october 1st 1996 and march 16 1998. material and methods: an ecological time series study was conducted. we assessed the relationship between the presence of acute respiratory illnesses, abac, and ira, and exposure to levels of particles less than 10 μg/m3 (pm10), smoke, and sulfur dioxide (so2); negative binomial regression models were used to assess latency periods of one to five days as well as the cumulative effect of seven days before the emergency visit. results: the levels of atmospheric pollutants were low, in general. the 24-hour mean values for pm10 levels, smoke, and so2, were 59.2 μg/m3 (sd=29.2), 27.7 μg/m3 (sd=21.2), and 21.1 μg/m3 (sd=20.1), respectively. an increase of 20 μg/m3 in the daily average of black smoke was associated with a 2.2% increase (95% ci 0.9-3.6) in the number of emergency visits for abac. a 20μg/m3 increase in the daily average of black smoke and so2 was associated with an increase in ari of 2.4% (95% ci 1.2-3.6), and 5% (95% ci 1.3-5.3), respectively, with a 5-day lag. we also ob served a cumulative effect for all the contaminants studied. conclusions: these results suggest that air pollution levels in havana city affect children's respiratory health; therefore implementation of control measures is necessary, especially those aimed at decreasing motor vehicle exhaust fumes
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