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In a population-based sample of couples from Beirut, the frequency of consanguineous marriages (25% on the average) rises when: (1) educational level of husband lowers; (2) occupational status of husband lowers; (3) shifting from Christians to Muslims. A multivariate analysis identifies low occupational status and Muslim religion as the two major correlates of consanguineous marriages, and confirms the decline of endogamy with time. Implications for future studies of consanguinity effects (control variables), as well as for public health action (definition of target population), are discussed.