Limitations during the summer

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The Cumulative Incidence is calculated by dividing the  number of cases  that appear in a period by the  number of people who are free of the disease  at the beginning of the period and is done every people to be able to make comparisons between territories with very different populations. The denominator uses population data from each of the Autonomous Communities, which is a fairly stable variable over short periods of time. This calculation method does not take into account (in reality it is very complicated to do so), the temporary population movements between the different Autonomous Communities, which mean that the real population of some territories, generally those located on the coast in the east and south of the country is multiplied during holidays and produces distortions in the AI, overestimating or underestimating the AI ​​depending on the case. Let's give two examples, the Community of Madrid during the summer holidays is one of the autonomous communities that temporarily

Loses population, it is difficult to know the exact numbers, but between 1 and 2 million people leave Madrid for more or less prolonged periods in the period. summer, while those from other Australia Phone Number Autonomous Communities and/or abroad are few at this time of year. This explains the apparently low AI (compared to other Autonomous Communities) in Madrid at the moment, the cases are related to a non-existent population. The opposite happens in Valencia or the Balearic Islands where the reference population is well below the real population because there are that receive tourism, national and international, which in many places can multiply its usual population by or 5, and which do not is counted in the denominator, offering values ​​far above reality.



It is not easy to correct these data because population mobility on these dates is very high, and in some places and/or areas, it varies practically every day, with very wide oscillations, which is why we must be very cautious with the data they can give us. Very wrong impressions. In any case, it is important to take into account the great mobility of the population at this time, which favors the spread of the virus, the presence of many unvaccinated people among the population and the fact that we have repeatedly pointed out, and that is unfortunately being confirmed (for example cases and by income) of people who, despite being vaccinated, are not immunized, which, even though they are proportionally few (around  do not stop them from being an important number that we must take into consideration (1% of the population are 470,000 people.