Seasonality of births and family characteristics in a Spanish population.
The seasonality of births in the period 1871-1977 is studied in a rural north-western Spanish population. Based on a total sample of 11,695 birth registrations, temporal variation is analysed. For siblings, according to family reconstitution, the total family size, the legitimacy of the child, and birth order are considered. A coefficient of birth month dispersion is defined and estimated for each family. Intra-family variation is related to inter-family coefficients in order to determine whether the local seasonal pattern of births may be partly explained by family characteristics.
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D001722:Birth Order; D001723:Birth Rate / Q000639:trends*; D005191:Family Characteristics; D006801:Humans; D012621:Seasons; D013030:Spain