Effectiveness of contraception
An attempt will be made in this chapter to analyze the effectiveness with which contraception in general and certain methods in particular are applied in Belgium. The study of the effectiveness of contraception is far from simple. It involves a considerable number of theoretical concepts, and use must be made of complex methods which permit exact calculations. The interested reader can find abundant information about both in the literature (Pearl, 1932; Gini, 1942; Tietze, 1959; Seklani, 1963; Potter, 1966; Henry, 1968). In connection with the 1971 survey results, we have also discussed these subjects in some detail (Cliquet et al., 1975a). Here, we shall limit ourselves to reporting the main results of our survey, with a preferatory discussion indicating where the main conceptual and statistical difficulties are encountered.
KeywordsFoam Sponge Amenorrhea Pregnan
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