A summary is presented of the workshop "top physics at linear colliders" that was held at IFIC Valencia from the 30th of June to the 3rd July 2015. We present an up-to-date status report of studies into the potential for top quark physics of lepton colliders with an energy reach that exceeds the top quark pair production threshold, with a focus on the linear collider projects ILC and CLIC. This summary shows that such projects can offer very competitive determinations of top quark properties (mass, width) and its interactions with other Standard Model particles, in particular electroweak gauge bosons and the Higgs boson. In both areas the prospects exceed the LHC potential significantly - often by an order of magnitude.

BACKGROUND:This study describes the perceived impact of H1N1 influenza and the adoption of the recommended measures to address the pandemic in schools.METHODS:A cross-sectional self-reported survey was conducted in 433 schools in Barcelona addressed to the school principal or the H1N1 influenza designated person. A descriptive analysis was performed, stratifying by educational level and type of school. A logistic regression analysis also was conducted.RESULTS:Around 70% of the respondents reported that there had been H1N1 influenza cases among students, being this percentage significantly higher among those schools offering primary education (74.4%) (p < .05). The main measures (single-use paper towels, availability of sanitizer solutions and 15 minutes ventilation per day of enclosed spaces) were implemented in most of the centers. However, the correct adoption of the main measures took place in around 30% of the schools, being the percentage lower in those offering only secondary education (Odds ratio [OR]: 0.518; 95% confidence interval [CI]:0.272-0.986) and those located in medium (OR: 0.438, 95% CI: 0.234-0.811) or low socioeconomic status (SES) districts (OR: 0.321, 95% CI: 0.159-0.649).CONCLUSIONS:Despite the climate of social alarm, the perceived impact of H1N1 influenza in most schools was moderate. In future potential threats, the educational level and the SES of the school should be considered, especially when measures requiring purchasing any product are recommended but not provided.

El desayuno representa la ingesta más importante de una alimentación equilibrada y su supresión se asocia al sobrepeso. El objetivo del estudio es estimar la prevalencia de sobrepeso y obesidad en adolescentes de Barcelona y analizar su asociación con hábitos alimentarios inadecuados y conductas sedentarias. Estudio transversal realizado en 2008 a una muestra representativa de estudiantes de secundaria de Barcelona. Se definió sobrepeso y obesidad en base al índice de masa corporal (IMC) a partir de medidas objetivas. Se determinó la prevalencia de sobrepeso y obesidad y se analizó su asociación con hábitos alimentarios, actividades sedentarias y actividad física mediante modelos de regresión logística. Se analizaron 3.089 escolares (52% chicas). La prevalencia de exceso de peso fue del 26,1% en chicos (6,2% obesidad) y del 20,6% en chicas (3,7% obesidad). En ambos sexos, el sobrepeso se asoció a una menor edad, menor frecuencia de desayunar, estar realizando una dieta para adelgazar y menor ingesta de alimentos menos saludables. Realizar dieta para adelgazar y una menor ingesta de alimentos menos saludables también se asociaron a la obesidad en ambos sexos. En chicos, además, la obesidad se asoció positivamente al sedentarismo. Los resultados reflejan la magnitud del sobrepeso y la obesidad como problema de salud pública y confirman la necesidad de la toma de desayuno para prevenir el exceso de peso. Además, permiten ampliar el conocimiento sobre los factores asociados al sobrepeso y obesidad para mejorar los programas de promoción de la salud en escolares ya existentes. Breakfast is considered the most important meal of the day in an equilibrated diet. Skipping breakfast has been associated with overweight. This study aimed to describe overweight and obesity among high school students in Barcelona and to analyze their association with eating habits and sedentary behaviors. A cross-sectional study was performed in 2008 on a representative sample of high-school students in Barcelona (Spain). Overweight and obesity were defined using Body Mass Index (BMI), which was calculated from objective measurements. The prevalences of overweight and obesity were determined, and their association with eating habits, sedentary behaviors, and physical activity was analyzed using logistic regression models. A total of 3,089 students were analyzed (52% girls). The prevalence of overweight was 26.1% in boys (6.2% obese) and 20.6% in girls (3.7% obese). In both sexes, overweight was associated with being younger, having breakfast less often, being on a diet, and with a lower frequency of unhealthy food intake. Being on a diet and a lower unhealthy food intake were related to obesity in both sexes. Among boys, obesity was also associated with sedentary behaviors. The results show that overweight and obesity are a serious public health problem and confirm the importance of breakfast to prevent overweight. Moreover, these results allow us to expand our knowledge on the factors associated with overweight and obesity in order to improve current school preventive programs.

Background A partial smoke-free regulation in Spain was introduced on January 1, 2006, which was subsequently amended to introduce a comprehensive smoke-free policy from 2 January 2011 onward. The objective of this study was to compare the prevalence of tobacco consumption in Spain and the profile of smokers before (2006) and after (2011) the comprehensive smoking ban passed in 2010. Methods Two independent, cross-sectional, population-based surveys were carried out among the adult (≥ 18 years old) Spanish population in 2006 and 2011 through telephone interviews. Both surveys used the same methods and questionnaire. Nicotine dependence was assessed with the Fagerström Test for nicotine dependence and readiness to quit according to the stages of change. Results The prevalence of tobacco consumption showed a nonsignificant decrease from 23.4% in 2006 to 20.7% in 2011. No changes were observed in nicotine dependence or readiness to quit. In 2011, most smokers (76%) showed low nicotine dependence and were mainly in the precontemplation stage (72%). Conclusions The prevalence of smokers has slightly decreased since the introduction of the total smoking ban in Spain. No differences were found in nicotine dependence or readiness to quit.

The aim was to assess the validity of self-reported exposure to second-hand smoke (SHS) in 50 hospitality venues of Madrid (Spain) in 2010, taking as a reference vapour-phase nicotine measured by active sampling. The questions posed in the questionnaire permitted distinguishing between the different levels of SHS. However, the moderate relationship found (Spearman׳s correlation=0.387, p<0.001) suggests that intensity of exposure to SHS in hospitality venues, based solely on self-reported information, should be used with caution.

Objectives: Smoking is a preventable cause of early death and the habit starts in adolescence. The aim of this study was to describe tobacco consumption in secondary school students in 2008 and trends in the last 20 years in Barcelona.Material and methods: We analyzed the trend in tobacco consumption by comparing data from 8 surveys carried out between 1987 and 2008 in the 8th (2 nd year of Compulsory Secondary Education), 10th (4th year of Compulsory Secondary Education) and 12th (2 nd year of Compulsory Secondary Education) years of secondary school. The FRESC questionnaire was used. Data on regular and daily consumption and associated factors in 2008 were gathered and compared with those corresponding to the previous studies. Percentages of annual change were calculated with Joinpoint regression and data were stratified by sex and year of education.Results: In 2008, 6.1% of boys and 4.5% of girls in the 8th year, 15.8% and 20.4% of those in the 10th year, respectively, and 26.1% and 33.1% of those in the 12th year, respectively, were regular smokers. A strong association was noted between regular smoking and cannabis consumption in three school years, as well as with having friends who were smokers and poor school performance. At 15-16 years old, the average annual decrease from 1996 to 2008 was 6.8% in girls and 6.1% in boys.Conclusions: Adolescent smoking has been decreasing in the last few years in Barcelona. There is a strong association between tobacco use and cannabis consumption. (C) 2013 SESPAS. Published by Elsevier Espana, S.L. All rights reserved.

INTRODUCTION:Breakfast is considered the most important meal of the day in an equilibrated diet. Skipping breakfast has been associated with overweight. This study aimed to describe overweight and obesity among high school students in Barcelona and to analyze their association with eating habits and sedentary behaviors. MATERIAL AND METHODS:A cross-sectional study was performed in 2008 on a representative sample of high-school students in Barcelona (Spain). Overweight and obesity were defined using Body Mass Index (BMI), which was calculated from objective measurements. The prevalences of overweight and obesity were determined, and their association with eating habits, sedentary behaviors, and physical activity was analyzed using logistic regression models. RESULTS:A total of 3,089 students were analyzed (52% girls). The prevalence of overweight was 26.1% in boys (6.2% obese) and 20.6% in girls (3.7% obese). In both sexes, overweight was associated with being younger, having breakfast less often, being on a diet, and with a lower frequency of unhealthy food intake. Being on a diet and a lower unhealthy food intake were related to obesity in both sexes. Among boys, obesity was also associated with sedentary behaviors. CONCLUSIONS:The results show that overweight and obesity are a serious public health problem and confirm the importance of breakfast to prevent overweight. Moreover, these results allow us to expand our knowledge on the factors associated with overweight and obesity in order to improve current school preventive programs.

The increasing use of mobile phones in the last decade has decreased landline telephone coverage in Spanish households. This study aimed to analyze sociodemographic characteristics and health indicators by type of telephone service (mobile phone vs. landline or landline and mobile phone). Two telephone surveys were conducted in Spanish samples (February 2010 and February 2011). Multivariate logistic regression analyses were performed to analyze differences in the main sociodemographic characteristics and health indicators according to the type of telephone service available in Spanish households. We obtained 2027 valid responses (1627 landline telephones and 400 mobile phones). Persons contacted through a mobile phone were more likely to be a foreigner, to belong to the manual social class, to have a lower educational level, and to be a smoker than those contacted through a landline telephone. The profile of the population that has only a mobile phone differs from that with a landline telephone. Therefore, telephone surveys that exclude mobile phones could show a selection bias. (C) 2013 SESPAS. Published by Elsevier Espana, S.L. All rights reserved.

The aim of this study was to assess the relationship between particulate matter of diameter≤2.5 µm (PM2.5) and airborne nicotine concentration as markers of second-hand smoke exposure with respect to the setting studied, the intensity of exposure, and the type of environment studied (indoors or outdoors). Data are derived from two independent studies that simultaneously measured PM2.5 and nicotine concentrations in the air as airborne markers of second-hand smoke exposure in public places and workplaces, including health care centres, bars, public administration offices, educational centres, and transportation. We obtained 213 simultaneous measures of airborne nicotine and PM2.5. Nicotine in the air was measured with active samplers containing a sodium bisulphate-treated filter that was analysed by gas chromatography/mass spectrometry. PM2.5 was measured with a SidePak AM510 Personal Aerosol Monitor. We calculated Spearman's rank correlation coefficient and its 95% confidence intervals (95% CI) between both measures for overall data and stratified by setting, type of environment (indoors/outdoors), and intensity of second-hand smoke exposure (low/high, according to the global median nicotine concentration). We also fitted generalized regression models to further explore these relationships. The median airborne nicotine concentration was 1.36 µg/m3, and the median PM2.5 concentration was 32.13 µg/m3. The overall correlation between both markers was high (Spearman's rank correlation coefficient=0.709; 95% CI: 0.635-0.770). Correlations were higher indoors (Spearman's rank correlation coefficient=0.739; 95% CI: 0.666-0.798) and in environments with high second-hand smoke exposure (Spearman's rank correlation coefficient=0.733; 95% CI: 0.631-0.810). The multivariate analysis adjusted for type of environment and intensity of second-hand smoke exposure confirmed a strong relationship (7.1% increase in geometric mean PM2.5 concentration per µg/m3 nicotine concentration), but only in indoor environments in a stratified analysis (6.7% increase; 95% CI: 4.3-9.1%). Although the overall correlation between airborne nicotine and PM2.5 is high, there is some variability regarding the type of environment and the intensity of second-hand smoke exposure. In the absence of other sources of combustion, air nicotine and PM2.5 measures can be used indoors, while PM2.5 should be used outdoors with caution.

Objetivos: El tabaquismo es causa de muerte prematura y prevenible, que se inicia en la adolescencia. Se describe el consumo de tabaco en escolares durante 2008 y la tendencia en los últimos 20 años en Barcelona. Material y métodos: Estudio de análisis de la tendencia del consumo. Se comparan datos de ocho encuestas realizadas entre 1987 y 2008 en 2° y 4° cursos de Educación Secundaria Obligatoria (ESO) y 2° de Bachillerato o Ciclos Formativos de Grado Medio. Se utilizó el cuestionario FRESC. Se presentan datos del consumo regular y diario de tabaco en 2008 y sus factores asociados, y se comparan con los de estudios precedentes. Se calculan los porcentajes de cambio anual mediante regresión joinpoint y se estratifica por sexo y curso académico. Resultados: En 2008 fumaban regularmente en ESO el 6,1% de los chicos y el 4,5% de las chicas de 2° curso, y el 15,8% y el 20,4% de 4° curso; en 2° curso de Bachillerato y Ciclos los porcentajes eran, respectivamente, el 26,1% y el 33,1%. Entre los factores asociados al consumo regular, en los tres cursos se observó una fuerte asociación entre consumo de tabaco y cannabis, así como tener amigos fumadores y un bajo rendimiento escolar. A los 15-16 años de edad, la disminución media anual desde 1996 hasta 2008 era del 6,8% en las chicas y del 6,1% en los chicos. Conclusiones: El consumo de tabaco en los adolescentes está disminuyendo desde hace algunos años en Barcelona. Hay una asociación muy intensa entre el consumo de tabaco y el de cannabis.

La aparición del teléfono móvil en las últimas décadas ha hecho disminuir la cobertura de hogares españoles con teléfono fijo. Este estudio analiza características sociodemográficas e indicadores de salud según el tipo de teléfono disponible (sólo móvil frente a fijo o fijo y móvil). Se realizaron dos encuestas telefónicas en muestras españolas (febrero de 2010 y febrero de 2011). Se analizaron diferencias en las principales características sociodemográficas según el tipo de teléfono disponible en el hogar, mediante análisis de regresión logística multivariada. Entre las dos encuestas se obtuvieron 2027 respuestas válidas (1627 en fijos y 400 en móviles). La probabilidad de seleccionar individuos extranjeros, de clase social manual, de menor nivel de estudios y fumadores fue mayor en la población contactada mediante teléfono móvil que mediante fijo. El perfil de la población que sólo dispone de teléfono móvil es diferente al de la que dispone de fijo, por lo que la realización de encuestas telefónicas exclusivamente mediante teléfonos fijos puede conllevar un sesgo de selección.

This study aimed to describe changes in attitudes and behaviours regarding influenza A infection 1 year after the end of the pandemic. A cross-sectional study was performed based on two population-based telephone surveys including 1027 (February, 2010) and 1000 (February, 2011) participants in Spain. The percentages of the respondents who reported that they had adopted preventive measures to avoid Influenza infection declined 1 year after the pandemic. Influenza-related consultations decreased, whereas confidence in vaccination increased. Despite the decrease observed in adopting preventive measures, some behaviours were still being adopted long time after the pandemic in general population.

Objective. To assess the effectiveness of a multi-level (individual, family, and school) school-based intervention to prevent the exposure to secondhand smoke (SHS) in a population of schoolchildren (12-14 years old).Method. This was a community trial with cluster randomization of schools to an intervention and comparison group (ClinicalTrials.Gov identifier NCT01881607). The intervention targeted schoolchildren in Terrassa (Catalonia, Spain). We assessed SHS exposure in different settings and tobacco consumption by means of a questionnaire before and one year after the intervention.Results. We analyzed data from 1734 students with both baseline and follow-up data. The crude analysis showed that SHS exposure among students in the intervention group significantly decreased at school (-14.0%), at home (-19.9%), and on transportation (-21.8%). In the comparison group, SUS exposure significantly decreased only at home (-16.9%). After adjustment for potential confounders, the good accomplishment of the activities showed a possible trend towards a non-significant reduction in exposure at home, transportation, and leisure time.Conclusion. While this school-based multi-level intervention had no overall effect in SHS exposure, the improvement of the activities focused on preventing SHS would be needed in order to achieve a significant decrease in the proportion of children exposed to SHS. (C) 2013 Elsevier Inc All rights reserved.

This study aimed to describe driving under the influence of alcohol or drugs (DUIAD) and riding in a vehicle with a driver under the influence of alcohol or drugs (RDUIAD) and their associated factors among rural and urban adolescents in Spain. We performed a cross-sectional study including 2067 students from Barcelona and a rural area 60 km north of this city. The prevalences of ever DUIAD and RDUIAD were 17% and 41% among 17-18 year-old adolescents. DUIAD was more common in boys. Living in the rural area was independently associated with these behaviours. Exposure to these behaviours is common among Spanish adolescents, especially in rural areas.

BACKGROUND:Numerous studies have assessed second-hand smoke (SHS) exposure but a gold standard remains to be established. This study aimed to review how SHS exposure has been assessed in adults in questionnaire-based epidemiological studies.METHODS:A literature search of original papers in English, French, Italian or Spanish published from January 2000 to May 2011 was performed using PubMed. The variables recorded for each study included target population, sample size, validation of the SHS questions, study design and phrasing of every question used to assess SHS exposure. For each item, information such as the setting where exposure was assessed or the indicator used to ascertain SHS exposure was extracted.RESULTS:We retrieved 977 articles, of which 335 matched the inclusion criteria. The main objective of 75.8% of the studies was to assess SHS exposure.The proportion of validated questions aiming to ascertain SHS exposure was 17.9%. Most studies collected data only for one (40.3%) or two settings (33.4%), most frequently the home (83.9%) and workplace (57%). The most commonly used indicator to ascertain exposure was the presence of smokers and 68.9% of the studies included an item to assess the intensity of SHS exposure.CONCLUSIONS:The variability in the indicators and items used to ascertain SHS exposure is very high, whereas the use of items derived from validated studies remains low. Identifying the diverse settings where SHS exposure may occur is essential to accurately assess exposure over time. A standard set of items to identify SHS exposure in distinct settings is needed.