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Normal pulmonary vessels A pulmonary vessel is composed of three concentric layers called "tunics": the inner layer (tunica intima),

En este artículo se identifican las etapas del proceso de difusión que han experimentado las primeras cohabitaciones en España, considerando la generación, el período de formación de la pareja, el nivel educativo y el nacimiento de un hijo como elementos clave para la lectura del proceso dentro de un contexto metodológico de riesgos competitivos (matrimonio o cohabitación como primera unión). Los resultados muestran una rápida difusión de la cohabitación como primera unión en España, que se inicia con las mujeres que formaron la unión entre 1980 y 1989 y se extiende siguiendo una orientación que va del alto al bajo.

While in Spain and Italy cohabitation has not acquired the same role that it has had in Northern Europe, in both of these Mediterranean countries cohabitation is no longer a marginal phenomenon. Moreover, the nature of cohabiting couples is diverse. According to the most recent FFS data, first cohabitations constitute a temporary arrangement that usually ends in the formalization of the union (marriage), and within 5 years 28.9 % of first cohabitations in Spain and 51.7 % in Italy were transformed into marriages. Within a Western context of changes in union formation patterns, the study of the choice between marriage and cohabitation as first union is of great significance. Is it possible to identify a shared pattern of union formation in Mediterranean countries like Italy and Spain? The purpose of this paper is to examine the choice between cohabitation and marriage as first union (timing, incidence and determinants) using a comparative life course approach. For the analysis of the timing and prevalence, cumulative incidence curves are calculated by birth cohorts and regions; while two semiparametric competing-risks models are estimated for the determinants of first partnership formation (one for each country), considering birth cohort, parental separation, educational attainment, employment status, age at leaving the parental home and birth of a child (the last three time-varying) as independent variables

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