A study on IUD retention by curve-fitting |
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| Authors: | Peng -Tu Liu Lien -Ping Chow Helen Abbey |
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| Institution: | 1. Department of Population Dynamics, The Johns Hopkins University School of Hygiene and Public Health, 21205, Baltimore, Maryland
2. Department of Biostatistics, The Johns Hopkins University School of Hygiene and Public Health, 21205, Baltimore, Maryland
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| Abstract: | In order to estimate the demographic impact of IUD, there is a need for estimating IUD retention rates beyond the period of actual observation. This article describes a mixed exponential function for this purpose. With this function of IUD retention, it is possible to estimate the “life expectancy” and “half-life” of an IUD. Another important concept is the “cut-off date”, introduced in estimating the “life expectancy” because in practice no IUD will be worn by a woman forever. |
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