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Male infertility Some research suggest that increased male age is associated with a decline in semen volume, sperm motility, and sperm morphology. 316 pp Knox,. 50 Historical trends by country edit Main article: Historical demography See also: Demographic transition adult dating in Stamford France edit Main article: Demographics of France The French pronatalist movement from failed to convince French couples they had a patriotic duty to help increase their country's birthrate. Bongaarts' model of components of fertility edit Bongaarts proposed a model where the total fertility rate of a population can be calculated from four proximate determinants and the total fecundity (TF).

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TFR tmfr Cm tmfr TN Cc Ca TN TF Ci Intercourse The first step is sexual intercourse, and an examination of the average age at first intercourse, the average frequency outside marriage, and the average frequency inside. Christ (ed.) Measurement in Economics. According to the March of Dimes, "At age 25, your risk of having a baby with Down syndrome is 1 in 1,340. Something else that will no doubt surprise you is how many of your neighbors hookup for hot play using the site. Demographer Ruth Frisch has argued that "It takes 50,000 calories to make a baby".

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