The practice of consanguineous marriage is still very widespread in Morocco and in the Arab-Muslim world, where the customs as well as the cultural, economic and social motivations have most often an influence on the marital choice within the family. The purpose of this study is to define the determinants of this practice in the city of Tiflet and regions (Morocco). A survey was conducted on 1000 pairs randomly sampled between June and November of 2012. The results reveal a high level of consanguinity (38.9 %) and a significant association between this marital practice and the geographical and sociocultural factors such as: the place of residence before marriage, the education level, the profession and the age in the marriage.

Several studies confirm the implication of the consanguinity in health problems and some countries still preserve this marital behavior. In this study, our objective is the analysis of consanguinity's impact on descendants' health in the Tiflet city and its regions (Northwest of Morocco). Data was collected between June and November 2012 and it was conducted on 1000 families. The calculation of the rate of the mortality concerned 3345 alive born descendants, while the biological effects of the consanguinity study was made on 3241 descendants. The results of this study show a significant association between the consanguinity and its incidence on health, such as the morbidity, the mortality and the abortion in the descendants.