Neumatización petromastoidea: Impacto de enfoque etiológico multifactorial, Pinar del Río. 1992-2007

petromastoid neumatization. impact of multifactorial etiological approach.pinar delrio.1992-2007.a cross-sectional qualitative,descriptive,observational study was carried out aimed at dermining the prevalence of the time of mastoid neumatization with the purpose of study those factors related to the condition in 900 children at the ages of 2,5 and 10 years (300 in every age group) through the x-ray of the mastoid apophysis using the shuller technique between january of 1992 to january 1997.from year 2006 on it was incorporated to a research project a new surgical procedure in children suffering from serous otitis media requiring to study the kind of temporal neumatization.the descriptive statistic method was used as well as the empirical method of surveys in order to register the history of acute or chronic otitis media and the bioethic principle of informed consent . the non parametric variables tests (chi-square) and or were used for analizing the relation among qualitative variables with a 95% of confidence. it was found any difference in the neumatization at different ages although the femenine sex and the history of otitis media were associated to the presence of non neumatization of the mastoid apophysis.it is concluded that the variation in neumatization is determined by the genetic code and influenced by other factors.