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TFR = TMFR × Cm TMFR = TN × Cc × Ca TN = TF × Ci Certain physical conditions may make it impossible for a woman to conceive.

This is called "involuntary infecundity." If the woman has a condition making it possible, but unlikely to conceive, this is termed "subfecundity." Venereal diseases (especially gonorrhea, syphilis, and chlamydia) are common causes.

The "Three-step Analysis" of the fertility process was introduced by Kingsley Davis and Judith Blake in 1956 and makes use of three proximate determinants: The latter developed the Easterlin hypothesis to account for the Baby Boom.

Bongaarts proposed a model where the total fertility rate of a population can be calculated from four proximate determinants and the total fecundity (TF).

While fertility can be measured, fecundity cannot be.