Best index of contraceptive efficacy is
Pearl index is defined as the number of failures per 100 woman years of exposure (HWY) Failure rate per Hundred Women Years = Total accidental pregnancies X 1200/ Total months of exposure Reference : Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 510
Pearl index
Chandelers index
Quetlet index
Broca index
Demography and family planning