Correlation of population variables and epidemic statistics as observed or predicted by the model in the different European countries.

aUS-MX travellers: the yearly number of travellers entering the country from US and Mexico as resulting from the analysis of air travel data [25].bLongitude: the longitude of the capital city of the country.cGDP: per capita gross domestic product of the country [25].dInter-EU passengers: the yearly number of travellers entering the country from other European countries as resulting from the analysis of air travel data [25].eHousehold size: the average number of members of households in the country [25].fAverage age: the average age (in years) of the population of the country [25].gFraction of children: the fraction of individuals aged less than 15 years old in the population of the country [25].hDay of the first case: obtained from the analysis of the WHO daily situation updates for pandemic (H1N1) 2009 [32].iPeak week: obtained from the analysis of the WHO situation update from week 40/2009 to week 07/2010 [6].