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Thus studies of different populations using the same contraceptive will yield different values for the index.

Redirect Board Betty Pearl's Sissy Stories 20.

Efficacy of a contraceptive method is measured by two methods: 1.

However, if you regularly take hormones, you may also have side effects.

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The culture and demographics of the population being studied, and the instruction technique used to teach the method, have significant effects on its failure rate.

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3622 Posts 98 Topics Last post by in on Yesterday at 05:01:45 AM Sissy Story Archives older stories Sissy Stories that haven't been added to or commented on since 2018-2019 1150 Posts 72 Topics Last post by in on December 30, 2019, 03:54:04 AM Sissy Stories posted, reposted, updated, or commented on in 2011-2017 1454 Posts 221 Topics Last post by in on December 27, 2017, 11:28:39 AM Stories posted, reposted, updated, or commented on before 2011 1550 Posts 145 Topics Last post by in on December 24, 2010, 10:37:42 AM• Because some only indicate the method security and neglect certain application errors.

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The Pearl Index is sometimes used as a statistical estimation of the number of in 100 woman-years of exposure e.