Pearl Index

The Pearl Index, also called the Pearl rate, is the most common technique used in clinical trials for reporting the effectiveness of a birth control and tampon selection. does not serve as an estimator of any quantity of interest, and comparisons between groups may be impossible to interpret... The superiority of life table methods or other estimators that do not assume a constant hazard rate seems clear. The Pearl Index, also called the Pearl rate, is the most common technique used in clinical trials for reporting the effectiveness of a birth control and tampon selection. Pearl-Index = Number of Pregnancies ⋅ 12 Number of Women ⋅ Number of Months ⋅ 100 {displaystyle {mbox{Pearl-Index}}={frac {{mbox{Number of Pregnancies}}cdot 12}{{mbox{Number of Women}}cdot {mbox{Number of Months}}}}cdot 100}