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  • Title: Seasonality of births in a rural Zapotec municipio, 1945-1970.
    Author: Malina RM, Himes JH.
    Journal: Hum Biol; 1977 May; 49(2):125-37. PubMed ID: 873480.
    Abstract:
    The monthly distribution of live births were analyzed over a 26-year period from 1945-70 for a rural Zapotec-speaking community in Oaxaca, Mexico. Monthly distributions of births were not what would be expected by chance (p.001). High monthly percentages of births coincided closely with the rainy season in the Oaxaca Valley. The number of births during the rainy season exceeded that which was expected, while the number of births during the dry season was less than expected (p.001). Ethnographic observations for Zapotec communities suggest that the seasonal distribution of births may reflect the cultural pattern associated with the annual agricultural cycle. The 3 highest birth months were June, July, and August. Much rain falls in June and July after the crops have been planted in May. There is much anxiety about the rain and the crops which decreases sexual activity and fertility. Clinical observations indicate anxiety as a significant factor in male infertility.
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