Los parámetros de crecimiento son un componente importante para la evaluación de las poblaciones de especies acuáticas explotadas. Sin embargo, es complicado aplicar métodos directos para estimar el crecimiento y analizar las diferencias entre machos y hembras particularmente en zonas tropicales. El objetivo de este estudio fue analizar el crecimiento entre cohortes de tres recursos tropicales y discutir las posibles implicaciones en el manejo pesquero. Se utilizó un método simple para comparar las curvas de crecimiento individual obtenidas a través del análisis de distribución de frecuencias de longitudes, para ello se usaron tres casos de estudio de especies tropicales provenientes de diferentes ambientes acuáticos: tilapia (Oreochromis aureus),pulpo rojo (Octopus maya)y la langosta del caribe (Panulirus argus).El análisis consistió en comparar la distribución de longitudes de hembras y machos obtenidas del análisis de progresión modal. Esta técnica puede ser utilizada para resaltar las diferencias en el crecimiento entre hembras y machos de una cohorte específica. En este documento se discute el efecto potencial de los factores intrínsecos y extrínsecos en el desarrollo de los organismos como se refleja en la distribución de tallas de las cohortes.

Growth parameters are an important component for the stock assessment of exploited aquatic species. However, it is often difficult to apply direct methods to estimate growth and to analyse the differences between males and females, particularly in tropical areas. The objective of this study was to analyse the inter-cohort growth of three tropical resources and discuss the possible fisheries management implications. A simple method was used to compare individual growth curves obtained from length frequency distribution analysis, illustrated by case studies of three tropical species from different aquatic environments: tilapia (Oreochromis aureus),red octopus (Octopus maya)and the Caribbean spiny lobster (Panulirus argus).The analysis undertaken compared the size distribution of males and females of a given cohort through modal progression analysis. The technique used proved to be useful for highlighting the differences in growth between females and males of a specific cohort. The potential effect of extrinsic and intrinsic factors on the organism's development as reflected in the size distribution of the cohorts is discussed.

OBJECTIVE: To estimate out-of-pocket expenditures for health care during the first hospitalization of children treated for leukemia in two hospitals of the Mexican Institute of Social Security (Instituto Mexicano del Seguro Social -IMSS-). MATERIAL AND METHODS: A cross-sectional study was conducted in Mexico City and Leon, Guanajato, Mexico in 1997. The study population consisted of the parents of 51 children under 15 years of age diagnosed with leukemia, who were hospitalized for the first time in two IMSS hospitals. A questionnaire was applied to participants to obtain direct and indirect expenditures during that period. Consumer price indexes (1997-2002) were used to estimate expenditure prices for 2002. Average expenditures and catastrophic expenditures were estimated. Factors associated with expenditures were analyzed using a linear regression model in which the dependent variable was the total household expenditures during hospitalization. RESULTS: The average household cost per hospitalization was 7 318 pesos, 86% of which corresponded to medical care and 14% to indirect costs. Catastrophic expenditures occurred in 14% of households. In 47% of household expenditures exceeded 100% of the total household income during the hospitalization period. Expenditures during hospitalization were associated with place of residence, income level, and type of medical insurance. CONCLUSIONS: Being an IMSS policyholder decreased out-of-pocket expenditures, but not complementary expenditures, which may still be unaffordable for a large segment of the population. For more than a half of the households studied, continuity of care was compromised, as expenditures during the first hospitalization entailed using up savings, going into debt, and/or selling household property.

OBJETIVO: Estimar el gasto de los hogares durante la primera hospitalización en 51 menores de 15 años de edad con leucemia, atendidos en dos hospitales del Instituto Mexicano del Seguro Social, en México durante 1997. MATERIAL Y MÉTODOS: Estudio transversal hecho en 1997 en el Distrito Federal y en León, Guanajuato. Se aplicó un cuestionario a los padres de 51 menores de 15 años de edad con diagnóstico de leucemia, hospitalizados por primera vez, en dos unidades del Instituto Mexicano del Seguro Social. Se capturó la información de los costos directos e indirectos enfrentados por los hogares durante esa primera hospitalización. Se aplicó el Indice de Precios al Consumidor (1997-2002) para expresar las estimaciones en precios de 2002. Se estimaron indicadores de gasto promedio y gastos catastróficos. Se establecieron los factores asociados, mediante un modelo de regresión lineal, utilizando el gasto total durante la hospitalización como variable dependiente. RESULTADOS: El costo promedio por paciente hospitalizado es de 7 318 pesos. El 86% corresponde a gastos asociados con la atención y 14% a costos indirectos. Para 14% de los hogares este gasto fue catastrófico. En 47% de los casos la erogación rebasó 100% de su ingreso disponible durante el periodo. Estos gastos se asociaron con lugar de residencia, nivel de ingreso y tipo de seguro. CONCLUSIONES: Ser derechohabiente de la seguridad social reduce los gastos de bolsillo por atención directa de los pacientes, pero no reduce los gastos complementarios, que pueden resultar onerosos para una elevada proporción de hogares. El costo de la primera hospitalización significó, en más de la mitad de los casos estudiados, el consumo de los ahorros, el endeudamiento o la venta de propiedades de los hogares, y dificultó la continuidad del tratamiento.

OBJECTIVE: To estimate out-of-pocket expenditures for health care during the first hospitalization of children treated for leukemia in two hospitals of the Mexican Institute of Social Security (Instituto Mexicano del Seguro Social -IMSS-). MATERIAL AND METHODS: A cross-sectional study was conducted in Mexico City and Leon, Guanajato, Mexico in 1997. The study population consisted of the parents of 51 children under 15 years of age diagnosed with leukemia, who were hospitalized for the first time in two IMSS hospitals. A questionnaire was applied to participants to obtain direct and indirect expenditures during that period. Consumer price indexes (1997-2002) were used to estimate expenditure prices for 2002. Average expenditures and catastrophic expenditures were estimated. Factors associated with expenditures were analyzed using a linear regression model in which the dependent variable was the total household expenditures during hospitalization. RESULTS: The average household cost per hospitalization was 7 318 pesos, 86% of which corresponded to medical care and 14% to indirect costs. Catastrophic expenditures occurred in 14% of households. In 47% of household expenditures exceeded 100% of the total household income during the hospitalization period. Expenditures during hospitalization were associated with place of residence, income level, and type of medical insurance. CONCLUSIONS: Being an IMSS policyholder decreased out-of-pocket expenditures, but not complementary expenditures, which may still be unaffordable for a large segment of the population. For more than a half of the households studied, continuity of care was compromised, as expenditures during the first hospitalization entailed using up savings, going into debt, and/or selling household property.

OBJETIVO: Estimar el gasto de los hogares durante la primera hospitalización en 51 menores de 15 años de edad con leucemia, atendidos en dos hospitales del Instituto Mexicano del Seguro Social, en México durante 1997. MATERIAL Y MÉTODOS: Estudio transversal hecho en 1997 en el Distrito Federal y en León, Guanajuato. Se aplicó un cuestionario a los padres de 51 menores de 15 años de edad con diagnóstico de leucemia, hospitalizados por primera vez, en dos unidades del Instituto Mexicano del Seguro Social. Se capturó la información de los costos directos e indirectos enfrentados por los hogares durante esa primera hospitalización. Se aplicó el Indice de Precios al Consumidor (1997-2002) para expresar las estimaciones en precios de 2002. Se estimaron indicadores de gasto promedio y gastos catastróficos. Se establecieron los factores asociados, mediante un modelo de regresión lineal, utilizando el gasto total durante la hospitalización como variable dependiente. RESULTADOS: El costo promedio por paciente hospitalizado es de 7 318 pesos. El 86% corresponde a gastos asociados con la atención y 14% a costos indirectos. Para 14% de los hogares este gasto fue catastrófico. En 47% de los casos la erogación rebasó 100% de su ingreso disponible durante el periodo. Estos gastos se asociaron con lugar de residencia, nivel de ingreso y tipo de seguro. CONCLUSIONES: Ser derechohabiente de la seguridad social reduce los gastos de bolsillo por atención directa de los pacientes, pero no reduce los gastos complementarios, que pueden resultar onerosos para una elevada proporción de hogares. El costo de la primera hospitalización significó, en más de la mitad de los casos estudiados, el consumo de los ahorros, el endeudamiento o la venta de propiedades de los hogares, y dificultó la continuidad del tratamiento.

Agressões de morcegos a pessoas vêm sendo notificadas em várias comunidades amazônicas nesta última década. Isto constitui um risco potencial para a raiva humana transmitida por morcegos. O objetivo deste estudo foi de analisar fatores associados a estas agressões em uma destas comunidades. Foi realizado um estudo transversal em um povoado de garimpeiros na Região Amazônica brasileira (160 habitantes). Foi realizada a captura de morcegos junto às casas e foram enviadas amostras para o laboratório. Das 129 pessoas entrevistas, 41% foram agredidas por morcegos pelo menos uma vez, com 92% das mordidas localizadas nos dedos dos pés. Por meio de regressão logística, encontrou-se que adultos eram agredidos ao redor de quatro vezes mais do que crianças (OR = 3,75, IC: 1,46-9,62, p = 0,036). Homens foram agredidos com maior freqüência do que mulheres (OR = 2,08, IC: 0,90-4,76, p = 0,067). Nove Desmodus rotundus e três morcegos frugívoros foram capturados e resultaram negativos para a raiva. O estudo sugere que, em áreas de garimpo, adultos do sexo masculino têm maior probabilidade de serem agredidos por morcegos. As ações de controle para a raiva humana a serem desenvolvidas nestes lugares devem dar ênfase especial a adultos homens. Recomendam-se mais investigações sobre o modo como o garimpo na Região Amazônica está colocando em risco as pessoas e o ambiente.

Many people in Amazonian communities have reported bat bites in the last decade. Bites by vampire bats can potentially transmit rabies to humans. The objective of this study was to analyze factors associated with bat biting in one of these communities. A cross-sectional survey was conducted in a village of gold miners in the Amazonian region of Brazil (160 inhabitants). Bats were captured near people's houses and sent to a lab. Of 129 people interviewed, 41% had been attacked by a bat at least once, with 92% of the bites located on the lower limbs. A logistic regression found that adults were bitten around four times more often than children (OR = 3.75, CI 95%: 1.46-9.62, p = 0.036). Males were bitten more frequently than females (OR = 2.08, CI 95%: 0.90-4.76, p = 0.067). Nine Desmodus rotundus and three frugivorous bats were captured and tested negative for rabies. The study suggests that, in an area of gold miners, common vampire bats are more likely to attack adults and males. The control strategy for human rabies developed in this region should therefore place special emphasis on adult males. There should also be more research on how the search for gold in the Amazonian region places people and the environment at risk.

Agressões de morcegos a pessoas vêm sendo notificadas em várias comunidades amazônicas nesta última década. Isto constitui um risco potencial para a raiva humana transmitida por morcegos. O objetivo deste estudo foi de analisar fatores associados a estas agressões em uma destas comunidades. Foi realizado um estudo transversal em um povoado de garimpeiros na Região Amazônica brasileira (160 habitantes). Foi realizada a captura de morcegos junto às casas e foram enviadas amostras para o laboratório. Das 129 pessoas entrevistas, 41% foram agredidas por morcegos pelo menos uma vez, com 92% das mordidas localizadas nos dedos dos pés. Por meio de regressão logística, encontrou-se que adultos eram agredidos ao redor de quatro vezes mais do que crianças (OR = 3,75, IC: 1,46-9,62, p = 0,036). Homens foram agredidos com maior freqüência do que mulheres (OR = 2,08, IC: 0,90-4,76, p = 0,067). Nove Desmodus rotundus e três morcegos frugívoros foram capturados e resultaram negativos para a raiva. O estudo sugere que, em áreas de garimpo, adultos do sexo masculino têm maior probabilidade de serem agredidos por morcegos. As ações de controle para a raiva humana a serem desenvolvidas nestes lugares devem dar ênfase especial a adultos homens. Recomendam-se mais investigações sobre o modo como o garimpo na Região Amazônica está colocando em risco as pessoas e o ambiente.

Many people in Amazonian communities have reported bat bites in the last decade. Bites by vampire bats can potentially transmit rabies to humans. The objective of this study was to analyze factors associated with bat biting in one of these communities. A cross-sectional survey was conducted in a village of gold miners in the Amazonian region of Brazil (160 inhabitants). Bats were captured near people's houses and sent to a lab. Of 129 people interviewed, 41% had been attacked by a bat at least once, with 92% of the bites located on the lower limbs. A logistic regression found that adults were bitten around four times more often than children (OR = 3.75, CI 95%: 1.46-9.62, p = 0.036). Males were bitten more frequently than females (OR = 2.08, CI 95%: 0.90-4.76, p = 0.067). Nine Desmodus rotundus and three frugivorous bats were captured and tested negative for rabies. The study suggests that, in an area of gold miners, common vampire bats are more likely to attack adults and males. The control strategy for human rabies developed in this region should therefore place special emphasis on adult males. There should also be more research on how the search for gold in the Amazonian region places people and the environment at risk.