Factors Contributing to Use-Effectiveness
A major contribution of Dr. Christopher Tietze to the evaluation of contraceptive methods was in the area of application of life-table methodology to study contraceptive effectiveness. Potter (1966) was the first to propose using life tables to calculate the risk of becoming pregnant over a certain time period of use. This was a great improvement over the use of the then commonly used Pearl Index (1932) which produced a measure of effectiveness that did not control for duration of use.
KeywordsPlacebo Estrogen Foam Insurance Coverage Income
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