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Updated: May 27, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation
Published on: November 29, 2018
Abstract:
Abstract Although the evidence supporting high fertility in Thailand is clear-cut, little is known about fertility differentials within the population. As part of a larger investigation, a special 1 % tabulation of the 1960 Thai census data on number of children ever-born to married women has been analysed to determine the extent of differentials by religion and urban-rural status. The findings point to considerable differentials among Buddhists, Moslems, and Confucianists. Standardizing for age, the number of children ever-born to 12/loslems averaged well below the number born to Buddhists. Confucian fertility was intermediate. Within specific age groups, the number of children ever-born to Moslem women was considerably below the Buddhist average and the differentials were sharper in the higher age groups. By contrast, Confucian fertility was highest of all in the age groups under 35, but lower than the Buddhist averages among older women. Significant urban-rural differentials also exist. For both the Buddhist and the Confucian women, fertility is markedly lower in urban than in rural categories. When controlling for both age and urban-rural status, Buddhist and Confucian differences tend to be minimal. By contrast, Moslem fertility was highest in the most urban category - Bangkok - but was considerably lower and substantially below the fertility levels of Buddhists and Confucianists in all other urban-rural categories. The census data in themselves do not permit adequate analysis of the reasons for the differentials. Later age at marriage in urban places may be a significant factor in accounting for the overall differentials in urban-rural fertility ; but this relation is much less clear for specific religious groups, particularly since Moslems marry at a considerably earlier age. More frequent divorce and remarriage may lower Moslem rates. Poorer health may also be a factor.
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