Contraceptive efficacy measured by -
(A) (Pearl index) (471 - Park 22nd)Pearl index and life table analysis** are used to measure contraceptive efficacy(A) PEARL INDEX is defined as the number of failures per 100 woman - years of exposure (HWY)Failure rate per HWY =Total accidental pregnancies------------------Total months of exposurex 1200* The factor 1200 is the number of months in 100 years*** Total month of exposure in the denominator is obtained by deducting from period under review of 10 months for a full term pregnancy and 4 months for an abortion.* Pearl index limitation is over come by using the method life-table analysis***(B Life-Table Analysis:* Calculative failure rate for each months of use*** A cumulative failure rate can then compare methods for any specific length of exposure.* Women who leave a study for any reason other than unintended pregnancy are removed from the analysis contributing their exposure until the time of the exit.
Pearl index
CPR
BBT method
Cervical mucous method
Demography and Family Planning