<prompt> Which of the following is impoant in calculation of pearl indexNumber of aboionsTotal accidental pregnanciesSocioeconomic statusTotal gestational period  <response>: 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 