DNA damage and its association with early-life exposome: Gene-environment analysis in Colombian children under five years old.

Environmental exposures and gene-exposure interactions are the major causes of some diseases. Early-life exposome studies are needed to elucidate the role of environmental exposures and their complex interactions with biological mechanisms involved in childhood health. This study aimed to determine the contribution of early-life exposome to DNA damage and the modifying effect of genetic polymorphisms involved in air pollutants metabolism, antioxidant defense, and DNA repair. We conducted a cohort study in 416 Colombian children under five years. Blood samples at baseline were collected to measure DNA damage by the Comet assay and to determine GSTT1, GSTM1, CYP1A1, H2AX, OGG1, and SOD2 genetic polymorphisms. The exposome was estimated using geographic information systems, remote sensing, LUR models, and questionnaires. The association exposome-DNA damage was estimated using the Elastic Net linear regression with log link. Our results suggest that exposure to PM2.5 one year before the blood draw (BBD) (0.83, 95 %CI: 0.76; 0.91), soft drinks consumption (0.94, 0.89; 0.98), and GSTM1 null genotype (0.05, 0.01; 0.36) diminished the DNA damage, whereas exposure to PM2.5 one-week BBD (1.18, 1.06; 1.32), NO2 lag-5 days BBD (1.27, 1.18; 1.36), in-house cockroaches (1.10, 1.00; 1.21) at the recruitment, crowding at home (1.34, 1.08; 1.67) at the recruitment, cereal consumption (1.11, 1.04; 1.19) and H2AX (AG/GG vs. AA) (1.44, 1.11; 1.88) increased the DNA damage. The interactions between H2AX (AG/GG vs. AA) genotypes with crowding and PM2.5 one week BBD, GSTM1 (null vs. present) with humidity at the first year of life, and OGG1 (SC/CC vs. SS) with walkability at the first year of life were significant. The early-life exposome contributes to elucidating the effect of environmental exposures on DNA damage in Colombian children under five years old. The exposome-DNA damage effect appears to be modulated by genetic variants in DNA repair and antioxidant defense enzymes.

Intra-urban variability of long-term exposure to PM2.5 and NO2 in five cities in Colombia.

Rapidly urbanizing cities in Latin America experience high levels of air pollution which are known risk factors for population health. However, the estimates of long-term exposure to air pollution are scarce in the region. We developed intraurban land use regression (LUR) models to map long-term exposure to fine particulate matter (PM2.5) and nitrogen dioxide (NO2) in the five largest cities in Colombia. We conducted air pollution measurement campaigns using gravimetric PM2.5 and passive NO2 sensors for 2 weeks during both the dry and rainy seasons in 2021 in the cities of Barranquilla, Bucaramanga, Bogotá, Cali, and Medellín, and combined these data with geospatial and meteorological variables. Annual models were developed using multivariable spatial regression models. The city annual PM2.5 mean concentrations measured ranged between 12.32 and 15.99 µg/m3 while NO2 concentrations ranged between 24.92 and 49.15 µg/m3. The PM2.5 annual models explained 82% of the variance (R2) in Medellín, 77% in Bucaramanga, 73% in Barranquilla, 70% in Cali, and 44% in Bogotá. The NO2 models explained 65% of the variance in Bucaramanga, 57% in Medellín, 44% in Cali, 40% in Bogotá, and 30% in Barranquilla. Most of the predictor variables included in the models were a combination of specific land use characteristics and roadway variables. Cross-validation suggests that PM2.5 outperformed NO2 models. The developed models can be used as exposure estimate in epidemiological studies, as input in hybrid models to improve personal exposure assessment, and for policy evaluation.

Contrary Perceptions of Environmental Health and the Governance of the Bucaramanga Metropolitan Area, Colombia.

The participation of civil society is essential for environmental health policies to be accepted. The objective of this study was to know the perceptions of government officials, members of civil society, and academics about environmental health problems and its governance in the Bucaramanga Metropolitan Area, Colombia. In the region, there is a strong citizens movement that defends the moorland ecosystem (páramo) as a source of drinking water for large-scale mining projects. A multi-method study was conducted, including the review of newspaper and scientific articles, a citizens survey, and interviews and focus groups with identified key stakeholders. The findings indicate that government officials prioritize their actions on issues related to air and water pollution and environmental education. In contrast, citizens prioritize water availability from the moorland ecosystem. There are some advances in the management of environmental health, mainly related to greater citizen awareness. Contrary perceptions among government officials, academics, and civil society prevent adequate prioritization of environmental health problems. Participation of civil society is absent in activities related to environmental governance. An ongoing citizens science experience engaging high school students and the academy can be the first meeting point with government officials in the pathway to improve the environmental governance in the territory. The participation of civil society in the environmental health governance must be enforced to broaden the issues of interest and prioritize the activities in short- and long-term policy planning.

Altitude and COVID-19 in Colombia: An updated analysis accounting for potential confounders.

We assessed the relationship between the altitude of municipalities and the incidence, mortality, and fatality from COVID-19 and excess of mortality in Colombia between 2020 and 2022. We conducted an ecologic study including all 1122 municipalities in Colombia and used categories of altitude as main independent variable. We fit multivariable regression models for incidence, mortality, fatality rates, and excess of mortality controlling for several variables at municipality level. There was a higher incidence rate, similar mortality rate and lower case-fatality rate for COVID-19 during 2020-2022 in municipalities in the upper category of altitude (>=2500 masl) compared to the lower category (<1000 masl). The excess of mortality was lower but not statistically different in municipalities in the upper category of altitude, and significantly lower in the intermediate altitude category compared to the lowlands. Our findings provide evidence that municipalities with high altitude had similar mortality rate, and lower case-fatality rate and excess of mortality for COVID-19 compared to lowlands in Colombia.

Geological context and human exposures to element mixtures in mining and agricultural settings in Colombia.

Anthropogenic and natural sources contribute to chemical mixtures in air, water, and soil, posing potential risks to the environment and human health. To understand the interplay between element profiles in the human body, geographical location, and associated economic activities, we carried out an observational analytic cross-sectional study. The study recruited 199 participants from three municipalities, two of which had gold-mining as their primary economic activity, while the other was dedicated to agricultural and other local activities not related to mining. The concentrations of a total of 30 elements in human hair samples and 21 elements in environmental soil samples were measured using various spectrometry techniques. Unsupervised clustering analysis using Self-Organizing Maps was applied to human hair samples to analyze element concentrations. Distinct clusters of individuals were identified based on their hair element profiles, which were mapped to geographical location and economic activities. While higher levels of heavy metals (Ag, As, Hg, and Pb) were observed in individuals engaged in mining activities in certain clusters, individuals in agricultural areas show higher concentrations of elements found in pesticides (Ba and Sr). However, the elemental composition of hair is influenced not only by the anthropogenic activities but also by the inherent geological context where people live. Our findings highlight the significance of accounting for environmental factors when evaluating human health risks, as the intricate mixture of elements can yield valuable insights for targeted health interventions.

Chemical Element Mixtures and Kidney Function in Mining and Non-Mining Settings in Northern Colombia.

The exposure to chemical mixtures is a problem of concern in developing countries and it is well known that the kidney is the major target organ for toxic elements. This cross-sectional study aimed to estimate the individual and composite mixture effect of a large number of chemical elements on kidney function in gold-mining and surrounding non-mining populations in northeast Colombia. We measured concentrations of 36 chemical elements in hair as indicators of chronic exposure from 199 adult participants. We estimated the effect of exposure to mixtures of chemical elements on estimated glomerular filtration rate (eGFR) using weighted quantile sum regression (WQS). The WQS index of the mixture was associated with reduced eGFR (Coefficient -2.42; 95%CI: -4.69, -0.16) being Be, Cd, Pb, As, and Mn, the principal contributors of the toxic mixture. Mining activities and Hg concentration were not associated with decreased kidney function. Our results suggest that complex mixtures of chemical elements, mainly heavy metals, act as nephrotoxic in these populations and therefore the analysis of chemical element mixtures is a better approach to identify environmental and occupational chemical risks for kidney damage.

Intraurban Geographic and Socioeconomic Inequalities of Mortality in Four Cities in Colombia.

Mortality inequalities have been described across Latin American countries, but less is known about inequalities within cities, where most populations live. We aimed to identify geographic and socioeconomic inequalities in mortality within the urban areas of four main cities in Colombia. We analyzed mortality due to non-violent causes of diseases in adults between 2015 and 2019 using census sectors as unit of analysis in Barranquilla, Bogotá, Cali, and Medellín. We calculated smoothed Bayesian mortality rates as main health outcomes and used concentration indexes (CInd) for assessing inequalities using the multidimensional poverty index (MPI) as the socioeconomic measure. Moran eigenvector spatial filters were calculated to capture the spatial patterns of mortality and then used in multivariable models of the association between mortality rates and quintiles of MPI. Social inequalities were evident but not consistent across cities. The most disadvantaged groups showed the highest mortality rates in Cali. Geographic inequalities in mortality rates, regardless of the adults and poverty distribution, were identified in each city, suggesting that other social, environmental, or individual conditions are impacting the spatial distribution of mortality rates within the four cities.

Avoidable mortality due to long-term exposure to PM2.5 in Colombia 2014-2019.

OBJECTIVE: To compare estimates of spatiotemporal variations of surface PM2.5 concentrations in Colombia from 2014 to 2019 derived from two global air quality models, as well as to quantify the avoidable deaths attributable to the long-term exposure to concentrations above the current and projected Colombian standard for PM2.5 annual mean at municipality level. METHODS: We retrieved PM2.5 concentrations at the surface level from the ACAG and CAMSRA global air quality models for all 1,122 municipalities, and compare 28 of them with available concentrations from monitor stations. Annual mortality data 2014-2019 by municipality of residence and pooled effect measures for total, natural and specific causes of mortality were used to calculate the number of annual avoidable deaths and years of potential life lost (YPLL) related to the excess of PM2.5 concentration over the current mean annual national standard of 25 µg/m3 and projected standard of 15 µg/m3. RESULTS: Compared to surface data from 28 municipalities with monitoring stations in 2019, ACAG and CAMSRA models under or overestimated annual mean PM2.5 concentrations. Estimations from ACAG model had a mean bias 1,7 µg/m3 compared to a mean bias of 4,7 µg/m3 from CAMSRA model. Using ACAG model, estimations of total nationally attributable deaths to PM2.5 exposure over 25 and 15 µg/m3 were 142 and 34,341, respectively. Cardiopulmonary diseases accounted for most of the attributable deaths due to PM2.5 excess of exposure (38%). Estimates of YPLL due to all-cause mortality for exceeding the national standard of 25 µg/m3 were 2,381 years. CONCLUSION: Comparison of two global air quality models for estimating surface PM2.5 concentrations during 2014-2019 at municipality scale in Colombia showed important differences. Avoidable deaths estimations represent the total number of deaths that could be avoided if the current and projected national standard for PM2.5 annual mean have been met, and show the health-benefit of the implementation of more restrictive air quality standards.

Air pollution, sociodemographic and health conditions effects on COVID-19 mortality in Colombia: An ecological study.

OBJECTIVE: The present study aimed to determine the association between chronic exposure to fine particulate matter (PM2.5), sociodemographic aspects, and health conditions with COVID-19 mortality in Colombia. METHODS: We performed an ecological study using data at the municipality level. We used COVID-19 data obtained from government public reports up to and including July 17th, 2020. We defined PM2.5 long-term exposure as the 2014-2018 average of the estimated concentrations at municipalities obtained from the Copernicus Atmospheric Monitoring Service Reanalysis (CAMSRA) model. We fitted a logit-negative binomial hurdle model for the mortality rate adjusting for sociodemographic and health conditions. RESULTS: Estimated mortality rate ratios (MRR) for long-term average PM2.5 were not statistically significant in either of the two components of the hurdle model (i.e., the likelihood of reporting at least one death or the count of fatal cases). We found that having 10% or more of the population over 65 years of age (MRR = 3.91 95%CI 2.24-6.81), the poverty index (MRR = 1.03 95%CI 1.01-1.05), and the prevalence of hypertension over 6% (MRR = 1.32 95%CI1.03-1.68) are the main factors associated with death rate at the municipality level. Having higher hospital beds capacity is inversely correlated to mortality. CONCLUSIONS: There was no evidence of an association between long-term exposure to PM2.5 and COVID-19 mortality rate at the municipality level in Colombia. Demographics, health system capacity, and social conditions did have evidence of an ecological effect on COVID-19 mortality. The use of model-based estimations of long-term PM2.5 exposure includes an undetermined level of uncertainty in the results, and therefore they should be interpreted as preliminary evidence.

Epidemia por COVID-19 en Colombia: del "pico" de la emergencia a la sostenibilidad de la respuesta / COVID-19 epidemic in Colombia: from the "peak" of the emergency to the sustainability of the response

Resumen El pasado 6 de marzo de 2020 se identificó el primer caso de infección por SARS-Cov-2 en Colombia. Luego de seis meses de desarrollo de la epidemia, la mayoría de las ciudades del país han experimentado un periodo agudo de ascenso de casos y fallecimientos, así como las consecuencias devastadoras sobre sus economías. En el ambiente nacional y regional se percibe un agotamiento gubernamental y ciudadano por la afectación de la epidemia en términos de la cantidad de infectados y fallecidos y por el tiempo transcurrido con las medidas de aislamiento preventivo obligatorio que se prolongaron desde el 25 de marzo hasta el 1 de septiembre en todo el territorio nacional. Sin embargo, estamos todavía lejos de estar cerca del final de la epidemia y en esta nueva etapa se requiere pasar del centralismo de la respuesta inicial a la sostenibilidad de la respuesta regional.

Abstract On March 6, 2020, the first case of SARS-Cov-2 infection was identified in Colombia. After six months of development of the epidemic in Colombia, most cities in the country have experienced an acute period of rise in cases and deaths as well as the devastating consequences on their economies. In the national and regional environment, government and citizen exhaustion is perceived due to the impact of the epidemic in terms of the number of infected and deceased and the time elapsed with the mandatory preventive isolation measures that lasted from March 25 to September 1 throughout the national territory. However, we are still far from being close to the end of the epidemic and in this new stage it is necessary to move from the centrality of the initial response to the sustainability of the regional response.

Estilos de crianza, autoeficacia parental y problemas conductuales infantiles en tres municipios de Santander / Parental style, parental self-efficacy and children behavioral problems in three municipalities of Santander

Resumen Introducción: La familia, a partir de la crianza, juega un papel fundamental en el desarrollo de habilidades sociales y de autocuidado de las personas. Objetivo: Describir los estilos de crianza, la autoeficacia parental y la percepción de problemas de la conducta infantil por parte de padres y cuidadores de niños, además, explorar diferencias por sexo y zona de residencia en tres municipios de Santander. Materiales y método: Estudio cuantitativo, observacional, descriptivo de corte transversal. Se incluyeron padres y cuidadores adultos de niños menores de 12 años residentes en los municipios de Girón, Lebrija y Matanza. Se aplicaron el cuestionario de capacidades y dificultades, la escala de estilo parental y la lista de verificación de las tareas parentales. Se realizaron comparaciones por sexo, municipio y zona (urbana/rural). Resultados: Participaron 1.425 adultos cuidadores de niños menores de 12 años. La mayoría de los participantes fueron mujeres (80%) y su rol era madre (70%). Se identificó una prevalencia alta de estilos de crianza disfuncionales caracterizados por la sobrerreactividad (36%), la laxitud (23%) y la hostilidad (22%). En la zona rural se encontró una mayor proporción de falta de autoeficacia contextual (p<0,001). Conclusiones: Se evidencia la presencia de estilos de crianza disfuncionales y alteraciones comportamentales de los niños que sugieren la necesidad de intervenciones poblacionales intersectoriales a padres y cuidadores. Se propone posicionar la crianza como un proceso de interés en salud pública.

Abstract Introduction: The family, through child rearing, has a key role in the development of children's social skills and self-care. Objective: To describe parental styles, parental self-efficacy and perception of children behavior's problems among parents and caregivers, and explore differences by sex and place of residence in three municipalities of Santander. Material and Method: Quantitative, observational, descriptive cross-sectional study. Participants were parents and caregivers of children under 12 years old, living in the municipalities of Girón, Lebrija, and Matanza. The Strengths and Difficulties Questionnaire, the Parenting Scale and the Parenting Tasks Checklist were used. Comparisons were made by sex, municipality, and zone (urban/rural). Results: Participants were 1425 parents and caregivers of children under 12 years old. Most participants were female (80%) and mothers (70%). High prevalence of dysfunctional parental styles was identified with predominance of over reactivity (36%), laxness (23%) and hostility (22%). Higher percentage of difficulties with parent's contextual self-efficacy was identified in the rural area (p<0,001). Conclusions: This study found dysfunctional parental styles and perception of children's behavioral problems that suggest the need for population-based interventions focused on parental skills for parents and caregivers. Child rearing is proposed as a process of interest in public health.

Proximity to two main sources of industrial outdoor air pollution and emergency department visits for childhood asthma in Edmonton, Canada.

OBJECTIVE: Children are recognized to be more susceptible than healthy adults to the effects of air pollution; however, relatively few Canadian studies of children have focused on industrial emissions. We conducted a spatial cross-sectional study to explore associations between emergency department (ED) visits for childhood asthma and residential proximity to two industrial sources of air pollution (coal-fired power plant and petrochemical industry) in Edmonton, Canada. METHODS: Using administrative health care data for Alberta between 2004 and 2010, we conducted a spatial analysis of disease clusters of count data around these two industrial sources. The distance from children's place of residence to these industrial sources was determined by using the six-character postal code from the children's ED visit. Clusters of cases were identified at the census dissemination area. Negative binomial multivariable spatial regression was used to estimate the risks of clusters in relation to the distance to these industrial sources. RESULTS: The relative risk of ED visits for asthma, calculated using a spatial scan test for events, was 10.4 (p value <0.01) within the power plant area when compared with the outside area. In addition, there was an inverse association of the distance to the power plant (coefficient = -0.01 per km) with asthma visits when multivariable models were used. No asthma clusters were identified around the petrochemical industrial area. CONCLUSION: Our analyses revealed that there was a cluster of ED visits for asthma among children who lived near the coal-fired power plant just outside Edmonton.

Evaluación de contenidos curriculares y percepción de competencias de estudiantes del área de la salud respecto del Modelo Integral de Atención en Salud en Colombia / Assessment of curricular contents and perception of competencies of health students related to the integrated health care model in Colombia

RESUMEN Objetivo Identificar la percepción de los estudiantes de último nivel de los programas de formación profesional y técnica en salud respecto a sus competencias para desempeñarse en el MIAS, y evaluar la presencia de dichas competencias dentro de los contenidos curriculares de los programas de salud en Santander. Métodos Se realizó un estudio descriptivo transversal en 451 estudiantes y una revisión documental de currículos de 26 programas. Se construyó y validó el contenido de un cuestionario en línea de percepción de competencias en los ámbitos del saber ser, saber conocer y saber hacer. Resultados En la revisión documental se encontró deficiencias en la inclusión de competencias tales como las de ejercer liderazgo (80 %) y realizar un enfoque diferencial en la atención (84 %). En la encuesta de percepción, el 36 % de los estudiantes manifestaron tener un conocimiento regular o deficiente sobre Rutas Integrales de Atención en Salud, planes de beneficios y actores del sistema de salud. Adicionalmente, el 7,5 % afirmaron ser poco competentes para realizar actividades de coordinación intersectorial, vigilancia epidemiológica o investigación en salud pública. Conclusiones Los resultados evidencian la necesidad de incluir en los currículos de programas de salud algunos aspectos fundamentales para la adecuada implementación del MIAS.(AU)

ABSTRACT Objective To identify the perception of the last level students of the professional and technical health training programs regarding their competences to perform in the MIAS, and to evaluate the presence of said competences within the curricular contents of the health programs in Santander. Methods A transversal descriptive study was carried out in 451 students and a documentary review of curricula was performed for 26 programs. The content of an online questionnaire on the perception of competences in the areas of knowledge, attitudes and abilities was constructed and validated. Results In the documentary review, deficiencies were found in the inclusion of competencies such as leadership (80 %) and differential approach in care (84 %). In the perception survey, 36 % of the students stated that they had regular or deficient knowledge about Integral Routes of Health Care, benefit plans and actors of the health system. Additionally, 7.5 % stated they were not competent to carry out intersectoral coordination activities, epidemiological surveillance or public health research. Conclusion: The results show the need to include in the curricula of health programs some fundamental aspects for the proper implementation of MIAS.(AU)

Inferencia causal en epidemiología / Causal inference in epidemiology

RESUMEN En este ensayo se revisa de manera breve el desenvolvimiento histórico de la definición de causa para comprender el desarrollo del pensamiento y de los modelos de causalidad. Posteriormente, se presentan los fundamentos teóricos que sustentan la identificación de relaciones causales y los modelos y métodos de análisis disponibles. Finalmente, se presentan algunas conclusiones respecto a las fortalezas y limitaciones que ofrece el análisis contrafactual en la identificación de relaciones causales en epidemiología social.(AU)

ABSTRACT This essay makes a brief account of the historical development of epidemiology as a fundamental element for understanding the development of thought and causality models. Subsequently, the theoretical foundations that support the identification of causal relationships and the available models and methods of analysis are exposed, providing some examples of their application. Finally, the strengths and limitations of this epidemiological analysis during the identification of causal relationships are presented.(AU)

Evaluación de percepción de competencias de trabajadores respecto del Modelo Integral de Atención en Salud / Perception of competencies of health workers related to the integrated health care model

Resumen Introducción: Santander es pionero en atención primaria y lidera la implementación del nuevo Modelo Integral de Atención en Salud (MIAS) en Colombia. Este proceso requiere fortalecer las competencias del recurso humano encargado de atender los usuarios del sistema de salud. Objetivo: Identificar la percepción de los trabajadores de salud del primer nivel, y sus supervisores, respecto a sus competencias para desempeñarse dentro del MIAS. Metodología: Estudio transversal. Se construyó y validó un cuestionario de competencias en el saber Ser, Conocer y Hacer, basado en lineamientos del MIAS e instrumentos de competencias de profesionales de medicina y enfermería; se aplicó en línea a profesionales de siete profesiones de salud y auxiliares de enfermería. Se realizó un análisis por grupo de trabajadores y se compararon las percepciones de éstos y sus supervisores. Resultados: Participaron 359 trabajadores y 102 supervisores. En el Ser hubo menores puntajes dados por los supervisores en competencias de liderazgo profesional, trabajo en equipo y autonomía profesional. En el Conocer observamos menor percepción en competencia sobre Rutas Integrales de Atención en Salud (RIAS), priorización de grupos de riesgo, niveles y redes de prestadores, planes de beneficios, actores del sistema, y actividades a realizar en los entornos definidos por el MIAS. En el Hacer las competencias con menores puntajes fueron actividades de investigación en salud pública y ejecución de programas intersectoriales. Conclusiones: Múltiples competencias se deben fortalecer en los trabajadores de salud del primer nivel de atención, para implementar el MIAS.

ABSTRACT Introduction: Santander is pioneer in primary health care and is leading the implementation of the new comprehensive health care model (CHCM) in Colombia. This process requires to strength the competences of the health system's workers. Objective: To identify the primary health care workers' perception, and their supervisor's perception, regarding their competences for working in the framework of the new CHCM. Methods: We conducted a cross-sectional online survey in health professionals and technicians, and their supervisors, working in primary health care centers. We built and validated a questionnaire for the assessment of the three competences dimensions (attitude, knowledge, skills) based on the CHCM conceptual documents and questionnaires of competences for physicians and nurses. We stratified results by health profession and then, the worker and supervisors' perceptions were compared. Results: Participants were 359 health workers and 102 supervisors. In the attitude dimension, scores of leadership, teamwork, and professional autonomy were lower in supervisors than workers. In the knowledge dimension, the items with lower perception were those related to the new healthcare delivery's routes, risk prioritization's mechanisms, health services' network, plans of benefits and health system's structure. In the skills dimension, the competences with lower scores were the ones related to public health research and interdisciplinary work. Conclusions: We identify specific competencies that should be strengthened in primary healthcare workers, in order to achieve the expected performance in the new healthcare model in Colombia.

[Assessment of curricular contents and perception of competencies of health students related to the integrated health care model in Colombia]. / Evaluación de contenidos curriculares y percepción de competencias de estudiantes del área de la salud respecto del Modelo Integral de Atención en Salud en Colombia.

OBJECTIVE: To identify the perception of the last level students of the professional and technical health training programs regarding their competences to perform in the MIAS, and to evaluate the presence of said competences within the curricular contents of the health programs in Santander. METHODS: A transversal descriptive study was carried out in 451 students and a documentary review of curricula was performed for 26 programs. The content of an online questionnaire on the perception of competences in the areas of knowledge, attitudes and abilities was constructed and validated. RESULTS: In the documentary review, deficiencies were found in the inclusion of competencies such as leadership (80 %) and differential approach in care (84 %). In the perception survey, 36 % of the students stated that they had regular or deficient knowledge about Integral Routes of Health Care, benefit plans and actors of the health system. Additionally, 7.5 % stated they were not competent to carry out intersectoral coordination activities, epidemiological surveillance or public health research. CONCLUSION: The results show the need to include in the curricula of health programs some fundamental aspects for the proper implementation of MIAS.

OBJETIVO: Identificar la percepción de los estudiantes de último nivel de los programas de formación profesional y técnica en salud respecto a sus competencias para desempeñarse en el MIAS, y evaluar la presencia de dichas competencias dentro de los contenidos curriculares de los programas de salud en Santander. MÉTODOS: Se realizó un estudio descriptivo transversal en 451 estudiantes y una revisión documental de currículos de 26 programas. Se construyó y validó el contenido de un cuestionario en línea de percepción de competencias en los ámbitos del saber ser, saber conocer y saber hacer. RESULTADOS: En la revisión documental se encontró deficiencias en la inclusión de competencias tales como las de ejercer liderazgo (80 %) y realizar un enfoque diferencial en la atención (84 %). En la encuesta de percepción, el 36 % de los estudiantes manifestaron tener un conocimiento regular o deficiente sobre Rutas Integrales de Atención en Salud, planes de beneficios y actores del sistema de salud. Adicionalmente, el 7,5 % afirmaron ser poco competentes para realizar actividades de coordinación intersectorial, vigilancia epidemiológica o investigación en salud pública. CONCLUSIONES: Los resultados evidencian la necesidad de incluir en los currículos de programas de salud algunos aspectos fundamentales para la adecuada implementación del MIAS.

[Causal inference in epidemiology]. / Inferencia causal en epidemiología.

This essay makes a brief account of the historical development of epidemiology as a fundamental element for understanding the development of thought and causality models. Subsequently, the theoretical foundations that support the identification of causal relationships and the available models and methods of analysis are exposed, providing some examples of their application. Finally, the strengths and limitations of this epidemiological analysis during the identification of causal relationships are presented.

En este ensayo se revisa de manera breve el desenvolvimiento histórico de la definición de causa para comprender el desarrollo del pensamiento y de los modelos de causalidad. Posteriormente, se presentan los fundamentos teóricos que sustentan la identificación de relaciones causales y los modelos y métodos de análisis disponibles. Finalmente, se presentan algunas conclusiones respecto a las fortalezas y limitaciones que ofrece el análisis contrafactual en la identificación de relaciones causales en epidemiología social.

Technical efficiency of women's health prevention programs in Bucaramanga, Colombia: a four-stage analysis.

BACKGROUND: Primary Health Care (PHC) is an efficient strategy to improve health outcomes in populations. Nevertheless, studies of technical efficiency in health care have focused on hospitals, with very little on primary health care centers. The objective of the present study was to use the Data Envelopment Analysis to estimate the technical efficiency of three women's health promotion and disease prevention programs offered by primary care centers in Bucaramanga, Colombia. METHODS: Efficiency was measured using a four-stage data envelopment analysis with a series of Tobit regressions to account for the effect of quality outcomes and context variables. Input/output information was collected from the institutions' records, chart reviews and personal interviews. Information about contextual variables was obtained from databases from the primary health program in the municipality. A jackknife analysis was used to assess the robustness of the results. RESULTS: The analysis was based on data from 21 public primary health care centers. The average efficiency scores, after adjusting for quality and context, were 92.4 %, 97.5 % and 86.2 % for the antenatal care (ANC), early detection of cervical cancer (EDCC) and family planning (FP) programs, respectively. On each program, 12 of the 21 (57.1 %) health centers were found to be technically efficient; having had the best-practice frontiers. Adjusting for context variables changed the scores and reference rankings of the three programs offered by the health centers. CONCLUSION: The performance of the women's health prevention programs offered by the centers was found to be heterogeneous. Adjusting for context and health care quality variables had a significant effect on the technical efficiency scores and ranking. The results can serve as a guide to strengthen management and organizational and planning processes related to local primary care services operating within a market-based model such as the one in Colombia.