These children with SA living at HA in a tropical middle-income developing country have a high prevalence of HDM sensitization. One explanation for this might be that tropical conditions, such as temperature and humidity, could modify the effect of the altitude on asthma.

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The evolution of the pay TV market and the profile of the subscribers M Medina [CV] [ 0000-0003-1754-6811] [ GS] Profesora Titular. Universidad de Navarra (España) mmedina@unav.es M Herrero [CV] [ 0000-0002-3695-4143] [GS] Profesora Titular. Universidad de Navarra (España) moherrero@unav.es I Portilla [CV][0000-0002-2504-868X][ GS] Profesora. Universidad de Navarra, España iportilla@unav.es Abstract Introduction. The audiovisual landscape has extraordinarily transformed in recent years due to technological and market conditions. Digitalization has created new possibilities for new content providers and audiovisual consumption has changed. Based on theories of substitution goods and competition forces, our analysis will focus on the impact of those structural changes on the nature of subscription services for audiovisual content, and from there, on the socio-demographic profile of the subscriber. Methodology. Data comes from three different surveys made in 2008, 2012 and 2016 in Spain. Results. Findings show that consumer profiles of the new platforms are similar to those of the traditional television subscriber, but there are some changes in terms of age and education. Conclusions. Socio-demographic variables are still relevant for defining subscribers, although the big data defenders tend to highlight behavioural data or purchase data.

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