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Births averted under family planning programme: a mathematical approach.

"In this paper a probability model is proposed to describe the distribution of births to couples in first T years of marriage, when T is large and/or when couples use various methods of family planning. This model is derived on the assumption that conditional instantaneous risk of a conception, the incidence of foetal loss and the chance of attaining [sterility] following a child birth are functions of parity....The application of the model in evaluation of family planning programme changes in the child bearing pattern is illustrated."